RFR: JDK-8313251: Add NativeLibraryLoad event [v4]

[Matthias Baesken]

> Add a NativeLibraryLoad event that provides us more detail about shared lib/dll loads. This gives a time stamp and success + error details of the load operation. It enhances the already existing information we get from the existing NativeLibrary event (that periodically samples the native modules of the jvm process).

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  Small event adjustments and use nullptr in case we have no message

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15065/files
  - new: https://git.openjdk.org/jdk/pull/15065/files/da6b9861..628336ce

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15065&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15065&range=02-03

  Stats: 18 lines in 5 files changed: 0 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/15065.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15065/head:pull/15065

PR: https://git.openjdk.org/jdk/pull/15065