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/test/test_animal.py

@@ -36,12 +36,12 @@ class TestAnimal(unittest.TestCase):
         # model = petstore_api.models.animal.Animal()  # noqa: E501
         if include_optional :
             return Animal(
-                class_name = '', 
+                className = '', 
                 color = 'red'
             )
         else :
             return Animal(
-                class_name = '',
+                className = '',
         )
 
     def testAnimal(self):

samples/openapi3/client/petstore/python/test/test_format_test.py

@@ -46,7 +46,7 @@ class TestFormatTest(unittest.TestCase):
                 string = 'a', 
                 byte = bytes("someting", 'utf-8'), 
                 binary = bytes(b'blah'), 
-                date = datetime.datetime.strptime('1975-12-30', '%Y-%m-%d').date(), 
+                var_date = datetime.datetime.strptime('1975-12-30', '%Y-%m-%d').date(),
                 date_time = datetime.datetime.strptime('2013-10-20 19:20:30.00', '%Y-%m-%d %H:%M:%S.%f'), 
                 uuid = '72f98069-206d-4f12-9f12-3d1e525a8e84', 
                 password = '0123456789', 

samples/openapi3/client/petstore/python/test/test_mixed_properties_and_additional_properties_class.py

@@ -40,7 +40,7 @@ class TestMixedPropertiesAndAdditionalPropertiesClass(unittest.TestCase):
                 date_time = datetime.datetime.strptime('2013-10-20 19:20:30.00', '%Y-%m-%d %H:%M:%S.%f'), 
                 map = {
                     'key' : petstore_api.models.animal.Animal(
-                        class_name = '', 
+                        className = '', 
                         color = 'red', )
                     }
             )

samples/openapi3/client/petstore/python/test/test_pet.py

@@ -41,7 +41,7 @@ class TestPet(unittest.TestCase):
                     id = 56, 
                     name = 'default-name', ), 
                 name = 'doggie', 
-                photo_urls = [
+                photoUrls = [
                     ''
                     ], 
                 tags = [
@@ -54,7 +54,7 @@ class TestPet(unittest.TestCase):
         else :
             return Pet(
                 name = 'doggie',
-                photo_urls = [
+                photoUrls = [
                     ''
                     ],
         )