Exposed type for scm method provider

[radhgupta]

This pull request refactors how method types are defined and used throughout the client model generator codebase. The main change is the introduction of a centralized MethodType enum within ScmMethodProvider, replacing the previous scattered and internal definitions. This improves code clarity, maintainability, and consistency when handling different method types (CreateRequest, Protocol, Convenience) in both implementation and tests.

Core Refactoring:

• Centralized the definition of method types by introducing the MethodType enum in ScmMethodProvider, with clear documentation for each type. Added convenience properties for checking method type.

Codebase-wide Adoption:

• Updated all usages of method types in RestClientProvider, ScmMethodProviderCollection, and related classes to use ScmMethodProvider.MethodType instead of the old internal enum.

Removal of Duplicated Enum:

• Removed the old internal MethodType enum from RestClientProvider, ensuring there is a single source of truth for method types.

Test Updates:

• Updated all affected tests in RestClientProviderTests to use the new ScmMethodProvider.MethodType enum for parameterized testing and assertions

These changes collectively improve code consistency, reduce duplication, and make the handling of client method types more robust and maintainable.#8037

[github-actions]

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[jorgerangel-msft]

Thanks for contributing! It's looking good. I do see several build errors in CI that will also need to be addressed.