Implement custom protoc plugin to generate OTLP JSON class definitions (#4910)

* add opentelemetry-codegen-json package

* add opentelemetry-proto-json package

* update project files to incorporate new packages

* add 'Private :: Do Not Upload' to codegen pyproject.toml classifiers

* add @json_serde decorator and update runtime utility file name

* update docstring

* add typechecking and linting for json codegen package

* update to use 'path.as_posix()' for Windows compatability

* add 'importlib.invalidate_caches()' to generate code fixture

* add USERNAME=runner env var to github workflows for Windows compatability

* update workflows

* update tox.ini

* update to use inheritence for common JSON serialization/deserialization methods

* fix link in opentelemetry-proto-json README

* add TODO to remove 'passenv' from tox.ini once fully upgraded to pytest 8.x.x

---------

Co-authored-by: Aaron Abbott <aaronabbott@google.com>

Author: herin049

.github/workflows/lint_0.yml

@@ -69,6 +69,44 @@ jobs:
       - name: Run tests
         run: tox -e lint-opentelemetry-proto-gen-latest
 
+  lint-opentelemetry-protojson-gen-latest:
+    name: opentelemetry-protojson-gen-latest
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout repo @ SHA - ${{ github.sha }}
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.14
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.14"
+
+      - name: Install tox
+        run: pip install tox-uv
+
+      - name: Run tests
+        run: tox -e lint-opentelemetry-protojson-gen-latest
+
+  lint-opentelemetry-codegen-json:
+    name: opentelemetry-codegen-json
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout repo @ SHA - ${{ github.sha }}
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.14
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.14"
+
+      - name: Install tox
+        run: pip install tox-uv
+
+      - name: Run tests
+        run: tox -e lint-opentelemetry-codegen-json
+
   lint-opentelemetry-sdk:
     name: opentelemetry-sdk
     runs-on: ubuntu-latest