opentelemetry-exporter-otlp-common: add shared package for common OTLP utilities (open-telemetry#5252)

* opentelemetry-exporter-otlp-common: add shared package for common OTLP utilities

* add changelog fragment

* add typechecking

* update tox environment names

* fix missing content-encoding header

* fix docs build failures

* add shutdown() method and remove close() method and remove shutdown_event from client ctor

* update retry-after parsing

Author: herin049

.changelog/5252.added

@@ -0,0 +1 @@
+`opentelemetry-exporter-otlp-common`: add shared package for common OTLP utilities

.github/workflows/lint.yml

@@ -214,6 +214,25 @@ jobs:
       - name: Run tests
         run: tox -e lint-opentelemetry-exporter-http-transport
 
+  lint-opentelemetry-exporter-otlpcommon-latest:
+    name: opentelemetry-exporter-otlpcommon-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-exporter-otlpcommon-latest
+
   lint-opentelemetry-exporter-opencensus:
     name: opentelemetry-exporter-opencensus
     runs-on: ubuntu-latest