feat(fastapi): add py.typed marker

[tamird]

Add the PEP 561 marker to the FastAPI instrumentation package so downstream type checkers consume its inline annotations.

Place the marker alongside the import package so Hatch includes it in both wheel and source distributions.

This is a non-breaking typing metadata change and does not require a core repository change.

[tamird]

@xrmx could you please take a look?

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[tamird]

@xrmx ping.

[tammy-baylis-swi]

Thanks for this @tamird ! Please could you clarify a bit more on what this does, and maybe why this instrumentation library in particular?

[tamird]

@tammy-baylis-swi it does what's on the tin. Why this one? Because it's the one I ran into and needed.

[xrmx]

@tammy-baylis-swi it does what's on the tin. Why this one? Because it's the one I ran into and needed.

The fastapi instrumentation is not typechecked atm so am not sure what would be the outcome if your typechecker can look inside it.

[tamird]

I don't know if it's type-checked in your CI, but it does have type annotations.

[xrmx]

I don't know if it's type-checked in your CI, but it does have type annotations.

Yeah I mean that the type annotations may not be correct if they are not typechecked.

[tamird]

I don't know if it's type-checked in your CI, but it does have type annotations.

Yeah I mean that the type annotations may not be correct if they are not typechecked.

Would you be more comfortable if this PR also added type checking?