Draft: Deprecate toLowerCase()/toUpperCase() and provide locale insensitive alternative

[Glavo]

Hi everyone,

A few months ago, I discussed in this mailing list[1] whether
toLowerCase()/toUpperCase() should be deprecated.
At that time, I received some approval and no one opposed the
idea. Therefore, I thought it might be time
to continue advancing this work, so I created a PR[2] for this.

This PR is still a draft, welcome to discuss it there.

I don't have much experience in contributing to OpenJDK yet, so I also hope
to get the help of experienced
contributors (such as creating CSR). Thanks!

Glavo

[1]
https://mail.openjdk.org/pipermail/core-libs-dev/2023-January/099375.html
[2] https://github.com/openjdk/jdk/pull/13434
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