RFR: 8290841: Notify menu event after a long press gesture on Android is not dispatched

Thu Jul 21 23:11:45 UTC 2022

This PR allows dispatching a menu event on Android to trigger a ContextMenuEvent. 

It is somehow a follow-up of [JDK-8245575](https://bugs.openjdk.java.net/browse/JDK-8245575), where the same was added for iOS.

While no test can be provided, the current changes have been tested, building and deploying on Android.

-------------

Commit messages:
 - Dispatch menu event on Android from native

Changes: https://git.openjdk.org/jfx/pull/843/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=843&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290841
  Stats: 43 lines in 4 files changed: 39 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/843.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/843/head:pull/843

PR: https://git.openjdk.org/jfx/pull/843