pydantic plugin

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there are many limitations with pyright's approach to pydantic, which is trying to get all its features to be standardized in the type system in the most special-cased way imaginable. creating the dataclass_transform decorator may have been easier than creating type system features to support the underlying runtime functionality that pydantic relies on, but what's the point of doing that instead of just making a plugin when the standardized features are so obviously specifically designed just for pydantic anyway.

once we have a plugin system (#22) we should just fix these issues using that instead:

• https://github.com/microsoft/pyright/issues/7209

• 667

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another issue with reportUnsafeMultipleInheritance:

from abc import ABC

from pydantic import BaseModel

class Foo:
    def __init__(self) -> None:
        pass

class Bar(Foo, BaseModel): ...  # error: reportUnsafeMultipleInheritance

this is because BaseModel uses dataclass_transform which assumes Bar now acts like a dataclass, but the generated __init__ methods in dataclasses don't call super().__init__. this is not the case with pydantic models so this situation is safe