Add acquireAsync

[dagnir]

Motivation and Context

This commit replaces tryAcquire with acquireAsync to better support async codepaths. acquireAsync returns a CompletableFuture that is completed when a token is successfully acquired; unlike tryAcquire, the caller is not expected to do any of their own waiting once future is complete.

Modifications

Testing

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 added tests to cover my changes
• All new and existing tests passed
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• 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