feat(texture): dispose of textures when no longer in use

[fallenoak]

This PR permits garbage collection and WebGL clean up for textures produced by TextureManager.

[codecov-commenter]

Codecov Report

Attention: 43 lines in your changes are missing coverage. Please review.

Comparison is base (ca01329) 21.42% compared to head (29e0508) 20.71%.

Files	Patch %	Lines
src/lib/texture/TextureManager.ts	0.00%	25 Missing and 4 partials ⚠️
src/lib/texture/ManagedCompressedTexture.ts	0.00%	6 Missing and 1 partial ⚠️
src/lib/texture/ManagedDataTexture.ts	0.00%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   21.42%   20.71%   -0.71%     
==========================================
  Files          20       22       +2     
  Lines         915      946      +31     
  Branches      189      195       +6     
==========================================
  Hits          196      196              
- Misses        623      648      +25     
- Partials       96      102       +6     

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