feat: add signed fetch

[kuruk-mm]

Note: It's initializing a new wallet for the scenes, that means that the comms and the scene sign will be different.

[codecov-commenter]

Codecov Report

Attention: 57 lines in your changes are missing coverage. Please review.

Comparison is base (9cd4af8) 16.97% compared to head (7f87f34) 16.65%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   16.97%   16.65%   -0.32%     
==========================================
  Files          61       62       +1     
  Lines        7837     7985     +148     
==========================================
  Hits         1330     1330              
- Misses       6507     6655     +148     

Files	Coverage Δ
rust/decentraland-godot-lib/src/comms/livekit.rs	0.00% <ø> (ø)
...t/decentraland-godot-lib/src/comms/signed_login.rs	0.00% <ø> (ø)
rust/decentraland-godot-lib/src/comms/ws_room.rs	0.00% <ø> (ø)
rust/decentraland-godot-lib/src/lib.rs	47.36% <ø> (ø)
...ecentraland-godot-lib/src/comms/player_identity.rs	0.00% <0.00%> (ø)
rust/decentraland-godot-lib/src/dcl/mod.rs	29.41% <0.00%> (-5.08%)	⬇️
...ust/decentraland-godot-lib/src/dcl/js/fetch/mod.rs	0.00% <0.00%> (ø)
...raland-godot-lib/src/scene_runner/scene_manager.rs	0.35% <0.00%> (-0.05%)	⬇️
rust/decentraland-godot-lib/src/dcl/js/mod.rs	0.00% <0.00%> (ø)
rust/decentraland-godot-lib/src/wallet/mod.rs	0.00% <0.00%> (ø)
... and 1 more

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