Support sentinel username in SentinelConfiguration

[vikasgarghb]

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This pull request allows you to provide username for sentinel which in turn allows support for ACL based authentication provided with redis 6.

This covers the issue mentioned here: #2218

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[mp911de]

Thanks for your pull request. I added comments regarding minor issues. Also, the formatting seems odd, care to have a look? You can find the formatter settings at https://github.com/spring-projects/spring-data-build/tree/main/etc/ide

[vikasgarghb]

@mp911de Can this be approved, merged and made part of the next release?

[mp911de]

Thanks a lot. I'm picking up this PR from here.

[mp911de]

Thank you for your contribution. That's merged and polished now.