WIP: sts: support credentials scope / access boundry / policy in sts for aws and gcp

[sandeepvinayak]

Summary

< Provide a brief description of the changes in this PR >

Some conventions to follow

1. add the module name as a prefix
   • for example: add a prefix: docstore: for document store module, blobstore for Blob Store module
2. for a test only PR, add test:
3. for a perf improvement only PR, add perf:
4. for a refactoring only PR, add "refactor:"

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.32867% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.97%. Comparing base (a02dece) to head (93408f7).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ava/com/salesforce/multicloudj/sts/gcp/GcpSts.java	60.27%	18 Missing and 11 partials ⚠️
...ava/com/salesforce/multicloudj/sts/aws/AwsSts.java	82.08%	3 Missing and 9 partials ⚠️

❌ Your patch status has failed because the patch coverage (71.32%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #239      +/-   ##
============================================
- Coverage     83.22%   82.97%   -0.25%     
  Complexity       94       94              
============================================
  Files           150      150              
  Lines          8242     8374     +132     
  Branches        959      991      +32     
============================================
+ Hits           6859     6948      +89     
- Misses          931      955      +24     
- Partials        452      471      +19     

Flag	Coverage Δ
unittests	82.97% <71.32%> (-0.25%)	⬇️

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