Add source-URI installer API and refactor installRequirements

[ehennestad]

• Added a new function installFromSourceUri in +matbox/+setup/installFromSourceUri.m to handle installation from both fex:// (File Exchange) and https://github.com/ URIs, returning a normalized install result structure.
• Updated installRequirements.m to use the new installFromSourceUri function for both GitHub and File Exchange dependencies, replacing the previous case-specific logic and removing duplicate helper functions.

[github-actions]

Test Results

21 tests   21 ✅  22s ⏱️
 5 suites   0 💤
 1 files     0 ❌

Results for commit 5bb8007.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 70.31250% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.92%. Comparing base (2519f3d) to head (5bb8007).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
code/+matbox/+setup/installFromSourceUri.m	67.79%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   42.02%   41.92%   -0.11%     
==========================================
  Files          59       60       +1     
  Lines        1468     1493      +25     
==========================================
+ Hits          617      626       +9     
- Misses        851      867      +16     

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