Enhancement: Introduce Option Interface for Future Interceptor Customization

[elliotmjackson]

Changes

• Added an Option interface to provide a mechanism for potential future implementations without breaking existing code.
• Updated the UnaryServerInterceptor and StreamServerInterceptor functions to accept variadic opts ...Option parameter.
• Documented the purpose and usage of the Option interface in comments.

Verification

• Tested the updated code by running unit tests related to the interceptors.
• Verified that the existing functionality of interceptors remains unchanged.
• Manually reviewed the code changes for clarity and adherence to best practices.

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[johanbrandhorst]

Thanks for the contribution!