[core][state] Case insensitive match for string value for state API filter.

[rickyyx]

Why are these changes needed?

Ran into an unexpected failure on https://github.com/ray-project/ray/issues/34554, where the query changes as we changes one of the value from (Worker to WORKER)

I think state API filtering could be less strict about case sensitivity, and I feel loosing it altogether would be ok and more usable.

I can hardly think of a usecase where case sensitivity on some fields would be useful. Of course, we could add a flag to the API to toggle this behaviour.

Related issue number

Closes https://github.com/ray-project/ray/issues/34554

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• Testing Strategy
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[rickyyx]

TODO

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[rickyyx]

Oops this slipped from the GA - @rkooo567 but I feel we could still get this in? Maybe add a change log in the docstring to document this like python does for each function.

[rkooo567]

yeah I think this makes more sense!

[rkooo567]

merge conflict?

[rickyyx]

A usability improvement for state API, would be great to get this in. cc @zhe-thoughts

TODO: waiting for test results. Adding test-ok once ready.

[zhe-thoughts]

@rickyyx @rkooo567 Please get this merged into master first (master is unfrozen for now). Thanks

[rickyyx]

Test failures unrelated.