feature: add test coverage

Example: https://github.com/joaomper-TE/thousandeyes-sdk-python/pull/25

.github/workflows/python.yaml

@@ -23,7 +23,17 @@ jobs:
       - name: Install and test modules
         run: |
           pip install pytest
+          pip install coverage
+          
           for module in $(find . -maxdepth 1 -type d -name "thousandeyes-sdk-*" ! -name "thousandeyes-sdk-core" | cut -c 3-); do            
             pip install -e $module
-            pytest $module
+            coverage run -m pytest $module
           done
+          coverage xml
+      - name: Get Cover 
+        uses: orgoro/coverage@v3.2
+        with:
+            coverageFile: ./coverage.xml
+            thresholdAll: 0.4
+            thresholdNew: 0.6
+            token: ${{ secrets.GITHUB_TOKEN }}