[CI] Improve issue templates (#12853)

Use YAML & add new bug templates to improve issue triaging.

---------

Co-authored-by: Alexey Sachkov <alexey.sachkov@intel.com>
Co-authored-by: Dmitry Vodopyanov <dmitry.vodopyanov@intel.com>
Co-authored-by: Justin Cai <justincai.lps@gmail.com>

.github/ISSUE_TEMPLATE/1-bug-report.yml

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+name: Bug report
+description: File a bug report to help us improve
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: how-to-reproduce
+    attributes:
+      label: To reproduce
+      description: Please describe the steps to reproduce the behavior
+      placeholder: |
+        1. Include a code snippet that is as short as possible
+        2. Specify the command which should be used to compile the program
+        3. Specify the command which should be used to launch the program
+        4. Indicate what is wrong and what was expected
+    validations:
+      required: false
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Please complete the following information
+      placeholder: |
+        - OS: [e.g Windows/Linux]
+        - Target device and vendor: [e.g. Intel GPU]
+        - DPC++ version: [e.g. commit hash or output of `clang++ --version`]
+        - Dependencies version: [e.g. the output of `sycl-ls --verbose`]
+    validations:
+      required: false
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/2-bug-report-cuda.yml

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+name: CUDA-specific bug report
+description: Please use this template in case of CUDA-specific issue
+labels: ["bug", "cuda"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: how-to-reproduce
+    attributes:
+      label: To reproduce
+      description: Please describe the steps to reproduce the behavior
+      placeholder: |
+        1. Include code snippet as short as possible
+        2. Specify the command which should be used to compile the program
+        3. Specify the command which should be used to launch the program
+        4. Indicate what is wrong and what was expected
+    validations:
+      required: false
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Please complete the following information
+      placeholder: |
+        - OS: [e.g Windows/Linux]
+        - Target device and vendor: [e.g. Nvidia GPU]
+        - DPC++ version: [e.g. commit hash or output of `clang++ --version`]
+        - Dependencies version: [e.g. the output of `nvidia-smi` and `sycl-ls --verbose`]
+    validations:
+      required: false
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/3-bug-report-hip.yml

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+name: HIP-specific bug report
+description: Please use this template in case of HIP-specific issue
+labels: ["bug", "hip"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: how-to-reproduce
+    attributes:
+      label: To reproduce
+      description: Please describe the steps to reproduce the behavior
+      placeholder: |
+        1. Include code snippet as short as possible
+        2. Specify the command which should be used to compile the program
+        3. Specify the command which should be used to launch the program
+        4. Indicate what is wrong and what was expected
+    validations:
+      required: false
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Please complete the following information
+      placeholder: |
+        - OS: [e.g Windows/Linux]
+        - Target device and vendor: [e.g. AMD GPU]
+        - DPC++ version: [e.g. commit hash or output of `clang++ --version`]
+        - Dependencies version: [e.g. the output of `rocm-smi` and `sycl-ls --verbose`]
+    validations:
+      required: false
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/4-feature-request.yml

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+name: Feature request
+description: Suggest an idea/improvement for this project
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Is your feature request related to a problem? Please describe
+      description: |
+        A clear and concise description of what the problem is.
+        Include reproducer or code/pseudo-code example.
+        Include specific environment details where problem occurs.
+    validations:
+      required: true
+  - type: textarea
+    id: desired-solution
+    attributes:
+      label: Describe the solution you would like
+      description: |
+        A clear and concise description of what you want to happen.
+    validations:
+      required: false
+  - type: textarea
+    id: alternative-solution
+    attributes:
+      label: Describe alternatives you have considered
+      description: |
+        A clear and concise description of any alternative solutions or features
+        you have considered.
+    validations:
+      required: false
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: |
+        Add any other context about the feature request here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Ask community a question
+    url: https://github.com/intel/llvm/discussions/categories/q-a
+    about: Please use Q&A Discussions category instead of Issues to ask questions