feat: add asset management commands

[wojciech-kulik]

New commands:

ASSETS SUBCOMMANDS:
  add-image-asset         Add an image asset.
  add-data-asset          Add a data asset.
  add-color-asset         Add a color asset.
  list-assets             List all assets.
  move-asset              Move an asset.
  delete-asset            Delete an asset.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 98.37838% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.47%. Comparing base (570dd9d) to head (63eb79c).

Files with missing lines	Patch %	Lines
Sources/XcodeProject/Utils/PathUtils.swift	71.42%	4 Missing ⚠️
...Core/AssetTemplateBuilders/ColorAssetBuilder.swift	97.95%	1 Missing ⚠️
Sources/XcodeProject/Models/HexColor.swift	94.11%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
+ Coverage   93.13%   95.47%   +2.33%     
==========================================
  Files          25       39      +14     
  Lines         612      972     +360     
==========================================
+ Hits          570      928     +358     
- Misses         42       44       +2     

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