[Doc] Apache Shiro docs for modern Java: virtual threads , structured concurrency and scoped value

[hrstoyanov]

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Apache Shiro docs discuss thread association of Subject, but modern Java now offers scoped values that eliminate the need for thread locals and structured concurrency for proper threads cleanup.

I would appreciate if the Apache Shiro docs are extended with these topics, some practical code is shown, especially for the custom Subject builder api

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[lprimak]

Largely agree, but neither Structured Concurrency nor Scoped Values are final yet.
Maybe just a bit of patience or a "preview note" would be prudent.

There is also an issue of "when" Shiro may adopt those concepts, since that will force minimal Java version to be quite high, or force us to do some kind of MR-Jar of plugin situation