python: generate Pydantic v2 + typing complete code (#16624)

* python: improve type generation with more specific typing

* Annotate function parameters

* Remove unused imports

* remove unused files

* remove temporary hack

* remove lock file

* fix Annotated import

* support Python 3.7

* Regenerate code with typing-extensions

* Fix setup.py

* More Pydantic v2 compatibility

* depend on pydantic v2

* fix client_echo tests

* fix JSON serialization

* Fix references

* Skip circular dependency tests for now

* Temporarily hide the "float" property

The "float" property aliases the "float" type and completely breaks the
model: all the properties that were "float" now become the type of the
"float" property instead.

* Fix errors

* Import Literal from typing_extensions

* Fix GitHub Action workflows

* Fix Python 3.7 failure

* Fix quotes

* Apply suggestions from code review

* Fix tests

* split model imports from other modules imports

* fix workflow

* Comment the array unique items convertion, remove set translation

* Replace alias usage

samples/openapi3/client/petstore/python/setup.py

@@ -28,8 +28,9 @@ REQUIRES = [
     "python-dateutil",
     "pem>=19.3.0",
     "pycryptodome>=3.9.0",
-    "pydantic >= 1.10.5, < 2",
-    "aenum"
+    "pydantic >= 2",
+    "aenum",
+    "typing-extensions >= 4.7.1",
 ]
 
 setup(