feat: ui for scenes

[leanmendoza]

Implement UI system for scenes

TODO list

• basic UiTransform
• basic UiBackground => color, nine slices, center and stretch mode
• basic UiText
• hide scene UI when is not current parcel scene nor global
  • define mechanism => only hide and keep computing, hide and stop computing (maybe save the dirties)
    • the root ui node is removed from the main scene tree, the ui doesn't receive any update until is added again. when the root scene ui node is added, all the dirty entities components are processed (except those were deleted)
• implement overflow visible and hidden
• UiText set font
• clean code

scroll deferred

To be implemented in other PR:

• VideoTexture for UiBackground
• AvatarTexture for UiBackground and Material
• UiDropdown
• UiInput
• PointerEvents

[codecov-commenter]

Codecov Report

Attention: 1079 lines in your changes are missing coverage. Please review.

Comparison is base (60e2fc8) 15.13% compared to head (a4535f0) 13.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
- Coverage   15.13%   13.98%   -1.15%     
==========================================
  Files          78       85       +7     
  Lines        9173    10169     +996     
==========================================
+ Hits         1388     1422      +34     
- Misses       7785     8747     +962     

Files	Coverage Δ
...godot-lib/src/scene_runner/components/billboard.rs	85.71% <100.00%> (-14.29%)	⬇️
...cene_runner/rpc_calls/handle_restricted_actions.rs	0.00% <0.00%> (ø)
...-lib/src/scene_runner/components/pointer_events.rs	0.00% <0.00%> (ø)
...odot-lib/src/scene_runner/components/visibility.rs	0.00% <0.00%> (ø)
...ot-lib/src/scene_runner/components/audio_source.rs	0.00% <0.00%> (ø)
...t-lib/src/scene_runner/components/avatar_attach.rs	0.00% <0.00%> (ø)
...ot-lib/src/scene_runner/components/avatar_shape.rs	0.00% <0.00%> (ø)
...ib/src/scene_runner/components/camera_mode_area.rs	0.00% <0.00%> (ø)
...odot-lib/src/scene_runner/components/text_shape.rs	0.00% <0.00%> (ø)
...t/decentraland-godot-lib/src/scene_runner/scene.rs	21.15% <33.33%> (-0.03%)	⬇️
... and 21 more

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[kuruk-mm]

(Deleted)

[kuruk-mm]

.

[kuruk-mm]

Looks great!!