[jdk11u-dev] RFR: 8256108: Create implementation for NSAccessibilityElement protocol peer

[Autumn Capasso]

[JDK-8256108](https://bugs.openjdk.org/browse/JDK-8256108) part of 28.

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Commit messages:
 - Update JavaComponentAccessibility.m
 - 8256108: Create implementation for NSAccessibilityElement protocol peer

Changes: https://git.openjdk.org/jdk11u-dev/pull/1565/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1565&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8256108
  Stats: 46 lines in 1 file changed: 44 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1565.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1565/head:pull/1565

PR: https://git.openjdk.org/jdk11u-dev/pull/1565