Add Support for Setting Execute Bit on Linux based on Extension

[Sewer56]

Fixes #924

Basic test included.
Draft until PR in Paths is merged,

• Added: Support for modifying Unix permissions. (fixes #37) NexusMods.Paths#38
  so I can include new dependency version.

[codecov-commenter]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (8bd7919) 55.28% compared to head (6f98411) 58.47%.
Report is 3 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #949      +/-   ##
==========================================
+ Coverage   55.28%   58.47%   +3.19%     
==========================================
  Files         620      626       +6     
  Lines       20058    20207     +149     
  Branches     1545     1554       +9     
==========================================
+ Hits        11089    11817     +728     
+ Misses       8620     8034     -586     
- Partials      349      356       +7     

Flag	Coverage Δ
Linux	57.81% <12.90%> (+3.07%)	⬆️
Windows	57.74% <3.22%> (+3.18%)	⬆️
clean_environment_tests	58.45% <16.12%> (+3.18%)	⬆️
network_tests	?
networking_tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ons.Loadouts.Synchronizers/ALoadoutSynchronizer.cs	92.21% <85.71%> (-0.14%)	⬇️
...sMods.DataModel.Tests/ALoadoutSynchronizerTests.cs	0.00% <0.00%> (ø)

... and 68 files with indirect coverage changes

[Al12rs]

Seems reasonable to me, but didn't test being on windows.

[erri120]

See comment.