RFR: 8347433: Deprecate XML interchange in java.management/javax/management/modelmbean/DescriptorSupport for removal [v4]

[Kevin Walls]

> DescriptorSupport has a constructor and a method providing creation from, and export to, XML.
> 
> These are unused in the JDK and have no practical known examples of usage.  XML parsing is best done by an independent implementation, not this class.

Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:

  reading to writing

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23038/files
  - new: https://git.openjdk.org/jdk/pull/23038/files/04d627c7..acdfef2b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23038&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23038&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23038.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23038/head:pull/23038

PR: https://git.openjdk.org/jdk/pull/23038