Enable pydantic mypy plugin (#87415)

mypy.ini

@@ -4,6 +4,7 @@
 
 [mypy]
 python_version = 3.10
+plugins = pydantic.mypy
 show_error_codes = true
 follow_imports = silent
 ignore_missing_imports = true
@@ -26,6 +27,12 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[pydantic-mypy]
+init_forbid_extra = true
+init_typed = true
+warn_required_dynamic_aliases = true
+warn_untyped_fields = true
+
 [mypy-homeassistant.*]
 no_implicit_reexport = true