Add support for SSO credentials provider

[Quanzzzz]

Add support for SSO Credentials Provider.

Description

In this pr, a credential provider that exchanges a resolved SSO login token for temporary AWS credentials is added. Besides, several new classes and tests are added to enable this credentials provider.

Main Updates since the first review:

1. Merged the SsoCredentialsProvider into part of the ProfileCredentialsProvider so the profile addressing part can be better taken care of;
2. Separate the generation of cached token path and resolution of access token to make it more flexible;
3. Updated all the tests to make them match the current code and achieve better coverage;

Besides the main changes for SSO, there are also some small changes to the code:

1. Corrected the javadocs of annotation SdkInternalApi to make it more accurate;
2. Moved the userHomeDirectorymethod out of ProfileFileLocation and put it in the utils module, thus it can be used by the other modules;

Motivation and Context

Currently, SSO provides customers an interface where customers can copy-paste snippests to set the environment variables to temporary credentials that they generate.
While the interface is good for console access and fine for occasional API use, it is painful for repeated API use as customers have to go back to the SSO page every hour to get new credentials. Allowing customers to use their existing login username and password to fetch temporart AWS credentials without having to go to an external site is a much more seamless experience.

Testing

Since this credentials provider include interaction with SSO service and it relies on another SSO login flow, so there isn’t integration tests added here. However, to make sure the functionality is sound, multiple unit tests and functional tests are added.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have read the README document
• I have added tests to cover my changes
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[sonarcloud]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities (and 1 Security Hotspot to review)
11 Code Smells

15.6% Coverage
0.0% Duplication

[codecov-io]

Codecov Report

Merging #2118 (a72aade) into master (040e854) will decrease coverage by 0.00%.
The diff coverage is 77.48%.

@@             Coverage Diff              @@
##             master    #2118      +/-   ##
============================================
- Coverage     77.44%   77.43%   -0.01%     
- Complexity      299      326      +27     
============================================
  Files          1214     1221       +7     
  Lines         38161    38292     +131     
  Branches       3014     3018       +4     
============================================
+ Hits          29552    29650      +98     
- Misses         7157     7187      +30     
- Partials       1452     1455       +3     

Flag	Coverage Δ	Complexity Δ
unittests	77.43% <77.48%> (-0.01%)	0.00 <27.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
.../credentials/internal/ProfileCredentialsUtils.java	78.72% <14.28%> (-10.57%)	0.00 <0.00> (ø)
...wssdk/services/sso/auth/ExpiredTokenException.java	53.84% <53.84%> (ø)	3.00 <3.00> (?)
...sso/auth/SsoProfileCredentialsProviderFactory.java	75.00% <75.00%> (ø)	3.00 <3.00> (?)
...wssdk/services/sso/internal/SsoTokenFileUtils.java	80.00% <80.00%> (ø)	4.00 <4.00> (?)
...ssdk/services/sso/auth/SsoCredentialsProvider.java	89.13% <89.13%> (ø)	9.00 <9.00> (?)
...re/amazon/awssdk/utils/UserHomeDirectoryUtils.java	93.33% <93.33%> (ø)	0.00 <0.00> (?)
...re/amazon/awssdk/profiles/ProfileFileLocation.java	87.50% <100.00%> (-2.83%)	0.00 <0.00> (ø)
...ervices/sso/internal/SessionCredentialsHolder.java	100.00% <100.00%> (ø)	3.00 <3.00> (?)
.../services/sso/internal/SsoAccessTokenProvider.java	100.00% <100.00%> (ø)	5.00 <5.00> (?)
...nio/netty/internal/OldConnectionReaperHandler.java	81.81% <0.00%> (-9.10%)	0.00% <0.00%> (ø%)
... and 10 more

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