Type annotation fix

[DN6]

What does this PR do?

Pipeline type annotations with List type do not show up in expected type because the check for inspect.isclass(v.annotation) cannot handle nested annotated types such as List[float].

This results in a an error when running the following check for expected types:

diffusers/src/diffusers/pipelines/pipeline_utils.py

Line 1025 in 375ec93

and not expected_types[kw] == (inspect.Signature.empty,) # Skip if no type annotations

The expected key isn't present during the check.

This PR:

• Updates _get_signature_types to account for List and Dict type annotations.

Fixes # (issue)

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[yiyixuxu]

thanks!