All Var-typed props are implicitly Optional

[masenf]

For compatibility with existing Component wraps, if the type is Var and a default is not provided, mark it as Optional and set a default of None.

Fix _rename_props inheritance for pydantic-v2.

This one might be slightly controversial, but the team doesn't like the newly added boilerplate of Optional[Var[...]] = None for most Component props. And if we enforce that in the framework, a lot of existing code outside of the reflex repo will break and have to change.

Reflex ships the pyi files that provide the correct annotations for these props, so we can still work with static type checking (and generate the Optional[Var[...]] = None annotation there). We can also ship the pyi_generator.py script as a module to allow downstream users to generate their own stub files for components that they wrap.

This will allow us to keep the delta smaller in the pydantic-v2 branch and reduce the perceived boilerplate from including the full annotation.

[coderabbitai]

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