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 (comment). Proposal: Move to separate issue.
• Use an internal index to more accurately track renames. Proposal: Move to separate issue.

[codecov]

Codecov Report

Attention: Patch coverage is 81.32296% with 48 lines in your changes missing coverage. Please review.

Project coverage is 79.1%. Comparing base (ec14259) to head (e21382d).

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	86.6%	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	63.6%	6 Missing and 2 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%   79.1%   -1.7%     
- Complexity     135     158     +23     
=========================================
  Files           16      23      +7     
  Lines          568     822    +254     
  Branches        66      95     +29     
=========================================
+ Hits           459     651    +192     
- Misses          69     108     +39     
- Partials        40      63     +23     

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[DavyLandman]

Just a few things I noticed.