Improved macOS support

[sungshik]

Overview

This is the main PR to address #4. Helper PRs:

• Improved macOS support: JNA #40
• Improved macOS support: java.nio.file Watch Service #41
• Improved macOS support: Small fixes #47
• Improved macOS support: Support for moving/renaming files #44

Tasks

• Support for renames (ITEM_RENAMED flag), including tests (use Files.move)
• Enqueue collections of events instead of individual events in WatchKey Moved: Enqueue collections of events instead of individual events in MacWatchKey? #48
• Use an internal index to more accurately track renames Moved: Use an internal index to more accurately track renames on macOS #49

[codecov]

Codecov Report

Attention: Patch coverage is 82.44275% with 46 lines in your changes missing coverage. Please review.

Project coverage is 81.6%. Comparing base (ec14259) to head (97dc29d).
Report is 58 commits behind head on main.

Files with missing lines	Patch %	Lines
...a/engineering/swat/watch/impl/mac/MacWatchKey.java	80.6%	4 Missing and 8 partials ⚠️
...neering/swat/watch/impl/mac/NativeEventStream.java	87.2%	4 Missing and 8 partials ⚠️
.../engineering/swat/watch/impl/mac/MacWatchable.java	56.5%	8 Missing and 2 partials ⚠️
...ava/engineering/swat/watch/impl/jdk/JDKPoller.java	73.9%	2 Missing and 4 partials ⚠️
...gineering/swat/watch/impl/mac/MacWatchService.java	53.8%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #39 +/- ##
=========================================
+ Coverage 80.8% 81.6% +0.8% - Complexity 135 163 +28 
=========================================
Files 16 23 +7 Lines 568 827 +259 Branches 66 97 +31 =========================================
+ Hits 459 675 +216 - Misses 69 91 +22 - Partials 40 61 +21 

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[DavyLandman]

Just a few things I noticed.