feat: implement string adapter for model and policy

[sanbei101]

This pull request introduces a new trait TryIntoModelFromStr and integrates it into the existing codebase. The main changes include adding the new trait, implementing it for &'static str, and updating the CoreApi and Enforcer to support the new trait. Additionally, new test cases have been added to ensure the functionality works as expected.

Introduction of TryIntoModelFromStr trait:

• src/convert.rs: Added TryIntoModelFromStr trait and implemented it for &'static str

Integration into CoreApi:

• src/core_api.rs: Updated imports and added methods new_raw_from_str and new_from_str to the CoreApi trait.

Integration into Enforcer:

• src/enforcer.rs: Updated imports and implemented the new methods new_raw_from_str and new_from_str in the Enforcer struct.

Testing:

• [src/enforcer.rs]: Added a new test case test_get_and_set_model_from_str to validate the new functionality.

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Benchmark for c5a05d3

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Test	PR Benchmark	Master Benchmark	%
b_benchmark_rbac_model_large	10.0±0.03ms	9.9±0.06ms	+1.01%
benchmark priority model	4.2±0.07µs	4.2±0.05µs	0.00%
benchmark_abac_model	2.5±0.05µs	2.5±0.03µs	0.00%
benchmark_basic_model	3.8±0.07µs	3.8±0.09µs	0.00%
benchmark_key_match	7.1±0.16µs	7.1±0.14µs	0.00%
benchmark_raw	0.0±0.00ns	0.0±0.00ns	NaN%
benchmark_rbac_model	6.1±0.10µs	6.2±0.10µs	-1.61%
benchmark_rbac_model_medium	917.1±12.59µs	846.3±9.78µs	+8.37%
benchmark_rbac_model_with_domains	6.0±0.11µs	6.0±0.10µs	0.00%
benchmark_rbac_with_deny	8.7±0.13µs	8.7±0.08µs	0.00%
benchmark_rbac_with_resource_roles	4.5±0.04µs	4.5±0.04µs	0.00%
benchmark_role_manager_large	4.5±0.06ms	4.5±0.04ms	0.00%
benchmark_role_manager_medium	306.0±7.46µs	303.7±4.45µs	+0.76%
benchmark_role_manager_small	92.2±2.32µs	96.1±6.76µs	-4.06%

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Benchmark for c5a05d3

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
b_benchmark_rbac_model_large	9.9±0.05ms	10.3±0.03ms	-3.88%
benchmark priority model	4.4±0.06µs	4.4±0.07µs	0.00%
benchmark_abac_model	2.6±0.03µs	2.6±0.04µs	0.00%
benchmark_basic_model	4.0±0.05µs	4.0±0.07µs	0.00%
benchmark_key_match	7.3±0.05µs	7.3±0.08µs	0.00%
benchmark_raw	0.0±0.00ns	0.0±0.00ns	NaN%
benchmark_rbac_model	6.3±0.09µs	6.4±0.04µs	-1.56%
benchmark_rbac_model_medium	835.8±10.08µs	831.7±11.53µs	+0.49%
benchmark_rbac_model_with_domains	6.2±0.07µs	6.2±0.12µs	0.00%
benchmark_rbac_with_deny	8.7±0.14µs	8.8±0.08µs	-1.14%
benchmark_rbac_with_resource_roles	4.6±0.05µs	4.6±0.05µs	0.00%
benchmark_role_manager_large	4.6±0.13ms	4.6±0.07ms	0.00%
benchmark_role_manager_medium	303.0±4.46µs	310.3±5.20µs	-2.35%
benchmark_role_manager_small	91.3±1.12µs	90.1±1.31µs	+1.33%