Support __get_validators__

[hramezani]

Closes #6899

[hramezani]

Don't know whether general_plain_validator_function is the right choice

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[samuelcolvin]

we should add a deprecation warning, otherwise LGTM.

[adriangb]

Do we care how this interacts with Annotated, including with other classes that implement __get_pydantic_core_schema__? Might be worth testing

[hramezani]

Do we care how this interacts with Annotated, including with other classes that implement __get_pydantic_core_schema__? Might be worth testing

@adriangb, I think we already have a test for this. Is that enough?

pydantic/tests/test_deprecated.py

Lines 498 to 523 in d110b47

	def test_v1_v2_custom_type_compatibility() -> None:
	"""Create a custom type that works with V1 and V2"""
	class MyType:
	@classmethod
	def __get_pydantic_core_schema__(cls, source_type: Any, handler: GetCoreSchemaHandler) -> CoreSchema:
	return core_schema.int_schema()
	@classmethod
	def __get_pydantic_json_schema__(
	cls, core_schema: CoreSchema, handler: GetJsonSchemaHandler
	) -> JsonSchemaValue:
	return {'anyOf': [{'type': 'string'}, {'type': 'number'}]}
	@classmethod
	def __modify_schema__(cls, field_schema: Dict[str, Any]) -> None:
	raise NotImplementedError # not actually called, we just want to make sure the method can exist
	@classmethod
	def __get_validators__(cls) -> Iterable[Any]:
	raise NotImplementedError # not actually called, we just want to make sure the method can exist
	yield
	ta = TypeAdapter(MyType)
	assert ta.validate_python('123') == 123
	assert ta.json_schema() == {'anyOf': [{'type': 'string'}, {'type': 'number'}]}

[adriangb]

But that doesn't use this new / old __get_valdiators__ right?