Adding New StsWebIdentityTokenFileCredentialsProvider in sts module that accepts STSClien

[joviegas]

Extension of PR #2488

Adding New WebIdentityTokenFileCredentialsProvider in sts that accepts STSClient

Description

• Currently the WebIdentityTokenFileCredentialsProvider is in core module and it creates AwsCredentialsProvider with Default Sts Client.
• We cannot modify the WebIdentityTokenCredentialsProviderFactory because the interface is marked as @FunctionalInterface and also StsClient is not available in core package so would need to pass SdkClient which would be confusing.
• Thus we have added a new WebIdentityTokenFileCredentialsProvider in Sts module and named it as StsWebIdentityTokenFileCredentialsProvider

Usage

1. Credential provider that will read web identity token file path, aws role arn, aws session name from system properties or environment variables And DefaultStsClient

StsWebIdentityTokenFileCredentialsProvider.builder().build();

2. Credential provider that will read web identity token file path, aws role arn, aws session name from system properties or environment variables And StsClient will be used as it is passed in the constructor.

StsWebIdentityTokenFileCredentialsProviderbuilder().stsClient(stsClient).build();

3 . Credential provider that will read web identity token file path, aws role arn, aws session name from Builders And StsClient will be used as it is passed in the Builder.

               StsWebIdentityTokenFileCredentialsProvider.builder()
                       .stsClient(stsClient)
                       .roleArn("someRole")
                       .webIdentityTokenFile(Paths.get(webIdentityTokenPath))
                       .roleSessionName("tempRoleSession")
                       .build();

Motivation and Context

• Please refer Pr Ability to customize stsClient in StsWebIdentityCredentialsProvider  #1881

Testing

• Added JUnit Test cases.

Screenshots (if appropriate)

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

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