[2.x] Improve the Vite integration

[caendesilva]

Targets #2006

• Refactors code
• Adds documentation
• Adds more tests
• Throws if the path is not a supported extension (Laravel assumes non-CSS is JavaScript... I'd rather be explicit)
• Removes the internal HYDE_SERVER_VITE environment variable
  • The complexity this adds to microoptimize things is not warranted yet
  • The Vite server configuration already manages adding and removing the hotfile.
  • We need this to print the start message. Instead, it renames the variable to be more clear it's internal Edit: Fixed by just touching the hotfile right away

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1a261e2) to head (83264ca).
Report is 31 commits behind head on new-asset-system.

Additional details and impacted files

@@                 Coverage Diff                  @@
##             new-asset-system     #2060   +/-   ##
====================================================
  Coverage              100.00%   100.00%           
- Complexity               1932      1937    +5     
====================================================
  Files                     196       196           
  Lines                    5141      5154   +13     
====================================================
+ Hits                     5141      5154   +13     

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[caendesilva]

This is seriously overkill, but it doesn't really add any more complexity to add all these. While they might not work unless more media file extensions are registered, adding all these here future proofs things without needing to support customization here.