[Serve] Preserve deployment metadata on wrapper classes

[teddygood]

Fixes #58240, Related to #57664

Ensure Serve wrapper classes preserve original class metadata. Wrappers now copy __qualname__, __module__, __doc__, __annotations__, and __wrapped__ in addition to __name__. Added tests to verify metadata preservation for task_consumer and ingress decorators.

[gemini-code-assist]

Code Review

This is a solid pull request that correctly addresses the issue of preserving metadata on wrapper classes in Ray Serve. The introduction of the copy_class_metadata utility function is a clean way to centralize this logic, and its application in the ingress and task_consumer decorators is appropriate. The new tests are well-written and provide good coverage for the added functionality, ensuring that attributes like __name__, __qualname__, __module__, __doc__, and __annotations__ are correctly propagated. The changes improve the introspection capabilities of Serve deployments and are a welcome enhancement.

[teddygood]

Hi @abrarsheikh
I opened this PR that updates Ray Serve to preserve deployment metadata on wrapper classes.
If you have a moment, could you please take a look or point me to the appropriate reviewer?
Thanks in advance for your time.