RFR: 8306634: Open source AWT Event related tests

[Harshitha Onkar]

This PR open sources few AWT Event related tests.

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Commit messages:
 - added AWT Event tests

Changes: https://git.openjdk.org/jdk/pull/13590/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13590&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306634
  Stats: 488 lines in 5 files changed: 488 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13590.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13590/head:pull/13590

PR: https://git.openjdk.org/jdk/pull/13590