feat: Add x/oauth2/google/externalaccount/aws/ecs package for Google Workload Identity Federation via ECS Metadata

[ginokent]

Ticket / Issue Number

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#3

What's changed

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• Added functionality to perform 'bar' on 'foo'.

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• Add appropriate test cases

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.63%. Comparing base (c8a6774) to head (e822bde).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #228      +/-   ##
==========================================
+ Coverage   91.26%   91.63%   +0.37%     
==========================================
  Files          99      100       +1     
  Lines        4898     4900       +2     
==========================================
+ Hits         4470     4490      +20     
+ Misses        428      408      -20     
- Partials        0        2       +2     

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