feat(exporter): Implement OTLP JSON exporters for HTTP transport

Add new packages for JSON-based OTLP exporters as alternatives to the existing
Protobuf-based exporters:
- opentelemetry-exporter-otlp-json-common: Common JSON encoding functionality
- opentelemetry-exporter-otlp-json-http: HTTP transport implementation

These exporters enable compatibility with services requiring JSON format
instead of Protobuf. Implementation includes full support for traces, metrics,
and logs with comprehensive test coverage following project guidelines.

Closes open-telemetry#1003

Author: andrewlwn77

.github/workflows/lint_0.yml

@@ -178,6 +178,24 @@ jobs:
       - name: Run tests
         run: tox -e lint-opentelemetry-exporter-otlp-proto-common
 
+  lint-opentelemetry-exporter-otlp-json-common:
+    name: opentelemetry-exporter-otlp-json-common
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo @ SHA - ${{ github.sha }}
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.12
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install tox
+        run: pip install tox
+
+      - name: Run tests
+        run: tox -e lint-opentelemetry-exporter-otlp-json-common
+
   lint-opentelemetry-exporter-otlp-combined:
     name: opentelemetry-exporter-otlp-combined
     runs-on: ubuntu-latest
@@ -232,6 +250,24 @@ jobs:
       - name: Run tests
         run: tox -e lint-opentelemetry-exporter-otlp-proto-http
 
+  lint-opentelemetry-exporter-otlp-json-http:
+    name: opentelemetry-exporter-otlp-json-http
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo @ SHA - ${{ github.sha }}
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.12
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install tox
+        run: pip install tox
+
+      - name: Run tests
+        run: tox -e lint-opentelemetry-exporter-otlp-json-http
+
   lint-opentelemetry-exporter-prometheus:
     name: opentelemetry-exporter-prometheus
     runs-on: ubuntu-latest