Add WebIdentityTokenCredentialsProvider

[hyunjong-lee]

Description

• To use EKS IRSA, WEB_IDENTITY_TOKEN_FILE must be supported and druid does not support it.
• Already submitted by Added WebIdentityTokenCredentialsProvider in AWS Credentials Provider… #9827, to use WEB_IDENTITY_TOKEN_FILE.
• It seems like that Added WebIdentityTokenCredentialsProvider in AWS Credentials Provider… #9827 is stopped, I am trying to use WEB_IDENTITY_TOKEN_FILE faster.

• Add WebIdentityTokenCredentialsProvider into defaultAWSCredentialsProviderChain method to use WEB_IDENTITY_TOKEN_FILE
  • Reference: https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-core/src/main/java/com/amazonaws/auth/DefaultAWSCredentialsProviderChain.java#L49

Fixed the bug ...

Renamed the class ...

Added a forbidden-apis entry ...

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This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

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Key changed/added classes in this PR

• AWSCredentialsUtils
• AWSModule

[hyunjong-lee]

• AWS module can't be tested by travis and also for code coverage.
• I will test changed part in EKS cluster and share WEB_IDENTITY_TOKEN_FILE based auth result.

[hyunjong-lee]

I had trying to use WEB_IDENTITY_TOKEN_FILE in S3.
While reading the code S3InputSource, I finally understand that access key using assume role will be timed-out after some period (default 1hour).
I did not intend this situation, so I finally understand why we should use AWS KEY directly without assume role.