RFR: 8333843: Provide guidelines on MemorySegment to read strings with known lengths [v3]

[Maurizio Cimadamore]

On Fri, 13 Sep 2024 10:27:27 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR proposes to add a new overload to `MemorySegment::getString` whereby it is possible to pass in a known byte length of the content in a segment that should be converted to a String. This is useful in case one already knows the byte length and thereby does not need to scan for a null terminator.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update after comments

Changes look good

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Marked as reviewed by mcimadamore (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20725#pullrequestreview-2302909492