RFR: 8302525: Write a test to checks various components sends Events while mouse and key operations simultaneously

[Ravi Gupta]

Main aim of this testcase is to test the behavior of various events under stress.

This testcase verifies the following assertions
a. This TestCase performs various mouse and key operations on components and checks whether all the events are getting triggered
b. properly. It also checks some of the component specific events like item, action wherever necessary.

Testing:
Tested using Mach5(20 times per platform) in macos,linux and windows and got all pass.

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Commit messages:
 - 8302525: Write a test to checks various components sends Events while mouse and key operations simultaneously

Changes: https://git.openjdk.org/jdk/pull/12571/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12571&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302525
  Stats: 556 lines in 1 file changed: 556 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/12571.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12571/head:pull/12571

PR: https://git.openjdk.org/jdk/pull/12571