RFR: 8328482: Convert and Open source few manual applet test to main based

[Tejesh R]

Convert and open source these manual applet test to main based:
java/awt/Frame/MegaIconTest/MegaIconTest.html
java/awt/Frame/FrameMaximizedTest/FrameMaximizedTest.html
java/awt/Frame/FrameMinimizeTest/FrameMinimizeTest.html
java/awt/Frame/SizeMinimizedTest/SizeMinimizedTest.html

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Commit messages:
 - Open source few Frame test

Changes: https://git.openjdk.org/jdk/pull/18448/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18448&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328482
  Stats: 501 lines in 7 files changed: 501 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18448.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18448/head:pull/18448

PR: https://git.openjdk.org/jdk/pull/18448