Added thailand (ap-southeast-7) region

[corymhall]

Added the new AWS Thailand (Bangkok) region ap-southeast-7 to the Region enum/interfaces.

This region was recently announced by AWS and is now generally available.

Reference: aws.amazon.com/local/thailand

re #5088

Co-authored-by: Tawan Chotikanchinda [email protected]

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

Maintainer note: consult the runbook for dealing with any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.46%. Comparing base (c62bffb) to head (7977a22).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5104   +/-   ##
=======================================
  Coverage   24.46%   24.46%           
=======================================
  Files         361      361           
  Lines      144037   144037           
=======================================
  Hits        35243    35243           
  Misses     108696   108696           
  Partials       98       98           

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