add initiall install asset library button

[BradyAJohnston]

Related to #465, this adds a button in the add-on preferences that the user can click to register the add-on's assets with Blender's asset library browser.

Allows for quicker adding of nodes in GN node trees (through drag-out from sockets) and will allow easier addition of new materials and the like.

• Potentially add the 'Install Asset Library' as a button for the panels to encourage the user to do so.
• Ensure proper cleanup of asset libraries on uninstall
• Categorize nodes for useful categories
• Rename nodes more generally for human readability

[codecov]

Codecov Report

Attention: Patch coverage is 45.65217% with 25 lines in your changes are missing coverage. Please review.

Project coverage is 77.33%. Comparing base (12fb08d) to head (2caf606).

Files	Patch %	Lines
molecularnodes/utils.py	48.83%	22 Missing ⚠️
molecularnodes/ui/pref.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #467      +/-   ##
==========================================
- Coverage   77.74%   77.33%   -0.41%     
==========================================
  Files          40       40              
  Lines        3612     3658      +46     
==========================================
+ Hits         2808     2829      +21     
- Misses        804      829      +25     

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