[jfx11u] RFR: 8259680: Need API to query states of CAPS LOCK and NUM LOCK keys

[Kevin Rushforth]

This is the backport of a small enhancement to add a query for CAPS_LOCK and NUM_LOCK to jfx11u.

The jfx mainline patch applied cleanly except for one conflict in an import statement which had to be manually resolved. I also needed to subsequently modify the `@since` tag in the new API method to reflect the change in release, as noted in the [CSR](https://bugs.openjdk.java.net/browse/JDK-8259868?focusedCommentId=14397008&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14397008).

I've sanity tested it on Windows. I will sanity test on Linux and Mac before integrating.

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Commit messages:
 - Update @since tag to 11.0.12
 - 8259680: Need API to query states of CAPS LOCK and NUM LOCK keys

Changes: https://git.openjdk.java.net/jfx11u/pull/4/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=4&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259680
  Stats: 446 lines in 15 files changed: 445 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/4.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/4/head:pull/4

PR: https://git.openjdk.java.net/jfx11u/pull/4