RFR: 8329667: [macos] Issue with JTree related fix for JDK-8317771 [v2]

[Alexander Zuev]

> Caching children and selected children of the thee on the native level;
> Caching all children of a specific parent in CAccessibility to enhance recursive children selection algorithm;
> Removing fix for JDK-8317771 as no longer needed;

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  - Removed the unused import in CAccessibility.java
  - Rolled back changes to the CommonComponentAccessibility and added relevant post*
  methods overrides to the OutlineAccessibility.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19255/files
  - new: https://git.openjdk.org/jdk/pull/19255/files/afdd5620..17033333

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19255&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19255&range=00-01

  Stats: 42 lines in 3 files changed: 28 ins; 13 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19255.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19255/head:pull/19255

PR: https://git.openjdk.org/jdk/pull/19255