[jdk11u-dev] RFR: JDK-8261351 Create implementation for NSAccessibilityRadioButton protocol

[Autumn Capasso]

[JDK-8261351 ](https://bugs.openjdk.org/browse/JDK-8261351) Mostly clean backport. 4/28 of the series of backports.

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Commit messages:
 - 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/1548/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1548&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8261351
  Stats: 654 lines in 11 files changed: 599 ins; 51 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1548.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1548/head:pull/1548

PR: https://git.openjdk.org/jdk11u-dev/pull/1548