Python: added ChatClientBase with function calling (#147)

* added ChatClientBase with function calling

* streaming update

* fixed typing

* test setup

* small update

* src setup

* removed src, updated test naming

* fixed test command

* alolow args

* updated test run

* added unit test folder to azure

* added init and unit test to azure

* added other cross tests

* restructured

* reset test run

* fix name

* removed always

* updated test

* extend pytest.xml locations

* run surface always

* added decorators for FC and marked tests

* fixed mypy settings and added tests

* fix override import

* removed import

python/.vscode/settings.json

@@ -19,11 +19,6 @@
         "editor.defaultFormatter": "charliermarsh.ruff"
     },
     "python.analysis.autoFormatStrings": true,
-    "python.analysis.extraPaths": [
-        "${workspaceFolder}/agent_framework",
-        "${workspaceFolder}/extensions/openai",
-        "${workspaceFolder}/extensions/azure"
-    ],
     "python.analysis.importFormat": "relative",
     "python.analysis.packageIndexDepths": [
         {