Add a separate schema parameter for model controller list view

[oburla-centumd]

... and use retrieve_schema as default value for it if unset. Possible way of using:

@api_controller("books/")
class BookController(ModelControllerBase):
    model_config = ModelConfig(
        model=Book,
        async_routes=True,
        create_schema=BookCreateIn,
        update_schema=BookUpdateIn,
        patch_schema=BookUpdateIn,
        retrieve_schema=BookOut,
        item_schema=BookItemOut
    )

Important for list view optimization as object schema may be much heavier than list item schema.

[oburla-centumd]

Found a way:

@api_controller("books/")
class BookController(ModelControllerBase):
    model_config = ModelConfig(
        model=Book,
        async_routes=True,
        create_schema=BookCreateIn,
        update_schema=BookUpdateIn,
        patch_schema=BookUpdateIn,
        retrieve_schema=BookOut,
        list_route_info={
            "schema_out": BookItemOut,
        },
    )