RFR: 8287809: Revisit implementation of memory session [v2]

[Maurizio Cimadamore]

> This is a JDK 19 clone of: https://urldefense.com/v3/__https://github.com/openjdk/jdk/pull/9017__;!!ACWV5N9M2RV99hQ!LqHfEzMnB5I2tQcPYGNk5lbO6mqR2JyzHIqL69ssF926nQucUWim_jTb-W8SGJKAO5suXHZeN0knE-kE0kLuHY9chG57$ 

Maurizio Cimadamore has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Merge branch 'master' into memory_session_cleanup
 - Fix issue in Direct-X-Buffer template
 - Simplify and drop the state class
 - Add missing files
 - Initial push

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Changes: https://git.openjdk.org/jdk19/pull/22/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=22&range=01
  Stats: 543 lines in 28 files changed: 48 ins; 110 del; 385 mod
  Patch: https://git.openjdk.org/jdk19/pull/22.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/22/head:pull/22

PR: https://git.openjdk.org/jdk19/pull/22