Add FS notify (inotify) functionality

[jasonrogena]

Add logic for notifying when files in registered directories change.

Signed-off-by: Jason Rogena jason@rogena.me

[codecov-commenter]

Codecov Report

Merging #3 (ff63e71) into main (d7bc742) will increase coverage by 1.18%.
The diff coverage is 80.08%.

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   78.27%   79.45%   +1.18%     
==========================================
  Files          11       14       +3     
  Lines         405      774     +369     
==========================================
+ Hits          317      615     +298     
- Misses         88      159      +71     

Impacted Files	Coverage Δ
src/main.rs	1.17% <0.00%> (-1.21%)	⬇️
src/library/mod.rs	67.47% <67.92%> (+6.61%)	⬆️
src/fs_notify/mod.rs	79.59% <79.59%> (ø)
src/library/mime_type/mod.rs	81.48% <80.00%> (ø)
src/fs_notify/tests_unsupported_os.rs	90.90% <90.90%> (ø)
src/fs_notify/tests_supported_os.rs	97.50% <97.50%> (ø)
src/config/mod.rs	75.00% <100.00%> (+1.31%)	⬆️
src/config/tests.rs	100.00% <100.00%> (ø)
src/library/mime_type/tests.rs	100.00% <100.00%> (ø)
src/library/tests.rs	100.00% <100.00%> (ø)
... and 1 more

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