[v2] Port SSO credential provider updates

[kyleknap]

The updates allow using sso-session configuration as part of the SSO credential provider. This was ported from this PR: boto/botocore#2812. We will follow up with this PR in merging this PR: #7364 that allows for interactive configuration of SSO sessions and direct login with SSO sessions.

[nateprewitt]

[codecov-commenter]

Codecov Report

Merging #7445 (0ca979c) into v2 (8fef0ef) will decrease coverage by 0.14%.
The diff coverage is 91.20%.

@@            Coverage Diff             @@
##               v2    #7445      +/-   ##
==========================================
- Coverage   93.71%   93.56%   -0.15%     
==========================================
  Files         351      351              
  Lines       36177    36203      +26     
  Branches     5203     5212       +9     
==========================================
- Hits        33903    33875      -28     
- Misses       1649     1684      +35     
- Partials      625      644      +19     

Impacted Files	Coverage Δ
awscli/botocore/utils.py	94.57% <82.97%> (-0.66%)	⬇️
awscli/botocore/credentials.py	97.08% <100.00%> (-0.42%)	⬇️
awscli/botocore/tokens.py	83.87% <100.00%> (+0.53%)	⬆️
awscli/s3transfer/compat.py	71.05% <0.00%> (-15.79%)	⬇️
awscli/customizations/s3/comparator.py	95.31% <0.00%> (-4.69%)	⬇️
awscli/compat.py	59.18% <0.00%> (-4.09%)	⬇️
awscli/s3transfer/tasks.py	91.66% <0.00%> (-3.34%)	⬇️
awscli/botocore/compat.py	91.30% <0.00%> (-2.18%)	⬇️
awscli/help.py	95.02% <0.00%> (-1.02%)	⬇️
awscli/customizations/codedeploy/push.py	91.00% <0.00%> (-1.00%)	⬇️
... and 24 more

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