[jdk11u-dev] RFR: 8256126: Create implementation for NSAccessibilityImage protocol peer

[Autumn Capasso]

Clean backport of [JDK-8256126](https://bugs.openjdk.org/browse/JDK-8256126) outside of having to modify the a few lines in one file which has had to be modified for each. This is part of broader group of changes as part of [JDK-8152350](https://bugs.openjdk.org/browse/JDK-8152350). 5/28 of the series of backports.

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Commit messages:
 - 8256126: Create implementation for NSAccessibilityImage protocol peer
 - 8261350: Create implementation for NSAccessibilityCheckBox protocol peer
 - 8261351: Create implementation for NSAccessibilityRadioButton protocol
 - JDK-8261352 create implementation for component peer for all the components who should be ignored in a11y interactions
 - 8256110: Create implementation for NSAccessibilityStepper protocol

Changes: https://git.openjdk.org/jdk11u-dev/pull/1557/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1557&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8256126
  Stats: 798 lines in 15 files changed: 744 ins; 51 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1557.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1557/head:pull/1557

PR: https://git.openjdk.org/jdk11u-dev/pull/1557