Replace JVM file watcher by alternatives that are not affected by filesystems boundaries about drain-java

[bric3]

Gradle's native-platform may not be a good fit after all.

Gradle's native-platform uses macOs's fsevents to handle file events, which does not pickup all file changes.
While looking at macOs tail source code I found that it is based on BSD's kqueue and this mechanisms report correctly single file changes.

This finding has been confirmed with the tool fswatch (it implements various way to watch files ; on macOS: fsevents, kqueue, or polling).

Reference issues :

• gradle/native-platform#269
• emcrisostomo/fswatch#265

[bric3]

Another idea would be to use JDK16's foreign linker incubator API to leverage kqueue (if JDK 16 is available).
Or write a JNI / C code.