[tools/model_explorer_circle] Introduce circle adapter for model expl… (

#14320)

It adds the initial version of circle adapter for model explorer.
It'll simply show a empty main graph when circle file is loaded.

ONE-DCO-1.0-Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>

tools/model_explorer_circle/.gitignore

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+venv
+src/*.egg-info/

tools/model_explorer_circle/README.md

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+# Circle adapter for Model Explorer
+
+Circle adapter is an extension adapter for displaying a Circle model in Model Explorer.
+
+* [Model Explorer](https://github.com/google-ai-edge/model-explorer)
+  * Visulization tool for various type of model graphs such as onnx, tflite, pt2 and mlir.
+

tools/model_explorer_circle/src/circle_adapter/main.py

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+#!/usr/bin/env python3
+
+# Copyright (c) 2024 Samsung Electronics Co., Ltd. All Rights Reserved
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Model Explorer adapter for Circle models."""
+
+from typing import Dict
+from model_explorer import Adapter, AdapterMetadata, ModelExplorerGraphs, graph_builder
+
+
+class CircleAdapter(Adapter):
+    """Adapter class for Circle models."""
+    metadata = AdapterMetadata(id='circle-adapter',
+                               name='Circle adapter',
+                               description='Circle adapter!',
+                               fileExts=['circle'])
+
+    def __init__(self):
+        super().__init__()
+
+    def convert(self, model_path: str, settings: Dict) -> ModelExplorerGraphs:
+        graph = graph_builder.Graph(id='main')
+        return {'graphs': [graph]}