RFR: 8304825: MacOS metal pipeline - window isn't painted if created during display sleep

[Alexey Ushakov]

Use one display link thread per MTLContext. Adjust the refresh rate with the current display.

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Commit messages:
 - 8304825: MacOS metal pipeline - window isn't painted if created during display sleep

Changes: https://git.openjdk.org/jdk/pull/13230/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13230&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304825
  Stats: 162 lines in 6 files changed: 107 ins; 29 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/13230.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13230/head:pull/13230

PR: https://git.openjdk.org/jdk/pull/13230