feat: add rust-feature to build without including ffmpeg and/or livekit

[leanmendoza]

Add feature-flag to include ffmpeg, livekit and deno_core/v8 by default
This enables an easy x86_64-android build by building it without default features (removing all of them).

[codecov-commenter]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (fb785e6) 49.59% compared to head (673f5cb) 47.65%.

Files	Patch %	Lines
...-godot-lib/src/scene_runner/components/material.rs	10.00%	9 Missing ⚠️
...ot-lib/src/scene_runner/components/video_player.rs	0.00%	5 Missing ⚠️
...t/decentraland-godot-lib/src/scene_runner/scene.rs	0.00%	4 Missing ⚠️
...land-godot-lib/src/scene_runner/godot_dcl_scene.rs	40.00%	3 Missing ⚠️
rust/decentraland-godot-lib/src/dcl/common/mod.rs	86.66%	2 Missing ⚠️
...aland-godot-lib/src/comms/communication_manager.rs	0.00%	1 Missing ⚠️
rust/decentraland-godot-lib/src/dcl/mod.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #170      +/-   ##
==========================================
- Coverage   49.59%   47.65%   -1.94%     
==========================================
  Files         139      140       +1     
  Lines       16841    16848       +7     
==========================================
- Hits         8352     8029     -323     
- Misses       8489     8819     +330     

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