Replace undocumented APIs with documented APIs in the OpenJDK

[dhanalla]

The wepoll code has been ported from opensource repo wepoll to OpenJDK in PR pull/3816, which incorporated undocumented Windows APIs (NtCreateKeyedEvent, NtReleaseKeyedEvent, NtWaitForKeyedEvent).

This PR aims to replace these undocumented APIs with documented synchronization APIs.

Test Performed:

1. All 12 tests in wepoll repo passed
   test-auto-drop-on-close PASS
   test-connect-fail-events PASS
   test-connect-success-events PASS
   test-ctl-fuzz PASS
   test-error PASS
   test-leak-1 PASS
   test-mixed-socket-types PASS
   test-multi-poll PASS
   test-oneshot-and-hangup PASS
   test-reflock PASS
   test-tree PASS
   test-udp-pings PASS
   DONE - 12 PASSED, 0 FAILED

2. No new failure in JTreg test

3. Micro bench results: similar performance score before and after the changes

without change in this PR:

With the change in this PR:

[swesonga]

Should we also create an issue in the wepoll repo so that this issue can also be addressed at the source?

[dhanalla]

Should we also create an issue in the wepoll repo so that this issue can also be addressed at the source?

Thanks @swesonga, The repository appears to be inactive, and no updates have been made since 11/30/2020.
The Visual Studio team opened PR #37 on wepoll branch, but there has been no response to it for several months.

[JohnTortugo]

LGTM