RFR: 8150564: Migrate useful ExtendedRobot methods into awt.Robot

[Alisen Chung]

Some useful methods in ExtendedRobot should be migrated into Robot itself so that ExtendedRobot can be removed in the future. The tests using ExtendedRobot for these migrated methods are changed to use only Robot (removing unnecessary building of ExtendedRobot).

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Commit messages:
 - extendedRobot
 - Merge branch 'master' of https://github.com/openjdk/jdk into 8150564
 - fix spacing
 - fix tests
 - added tests
 - init commit

Changes: https://git.openjdk.org/jdk/pull/22044/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22044&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8150564
  Stats: 875 lines in 236 files changed: 263 ins; 439 del; 173 mod
  Patch: https://git.openjdk.org/jdk/pull/22044.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22044/head:pull/22044

PR: https://git.openjdk.org/jdk/pull/22044