feat: add imds and external uri in default chain && refactor credenti…

[yndu13]

…als provider

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.73554% with 50 lines in your changes missing coverage. Please review.

Project coverage is 94.08%. Comparing base (1a7bea3) to head (e1d2392).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
sdk/auth/credentials/credentials.go	93.63%	14 Missing and 10 partials ⚠️
...k/auth/credentials/profile_credentials_provider.go	72.97%	7 Missing and 3 partials ⚠️
...k/auth/credentials/default_credentials_provider.go	78.78%	4 Missing and 3 partials ⚠️
sdk/auth/credentials/uri_credentials_provider.go	94.23%	4 Missing and 2 partials ⚠️
...th/credentials/cli_profile_credentials_provider.go	94.44%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #660      +/-   ##
==========================================
- Coverage   94.57%   94.08%   -0.49%     
==========================================
  Files          56       57       +1     
  Lines        3961     4529     +568     
==========================================
+ Hits         3746     4261     +515     
- Misses        157      192      +35     
- Partials       58       76      +18     

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