(short issue description)Create an Region Enum like Java SDK

[github2023spring]

Describe the feature

Create an Region Enum like Java SDK

Use Case

I can use pattern matching to evaluate regions, and I don't need to refer to AWS documentation for region.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

A note for the community

Community Note

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