feat: avatar masks (#7462)

* First working iteration of masks

* Integrated network propagation of emote masks

* Updated tests

* Fixed remote client not syncing scene emote until emote was played on remote client

* Centralized scene emote prefix and added precomputed prefix span, minor cleanup

* Fixed masked emote intentions delayed consume due to movement check and delayed play due to the same reason.

* StopEmote restricted action

* Fixed race conditions and strengthened stop logic

* Cancel emote animation when leaving a scene

* Fixed prop animations setup and head IK disabled when playing a masked emote

* - refactored character emote system to handle masked emotes as a different CharacterMaskedEmoteComponent
- minor fixes

* Small changes in CharacterAnimator.controller

* Fixed masked emote pause and resume when exiting / entering scene

* refactored mask emote handling in dedicated per-scene ecs system

* Optimizations and code reuse

* Fixed bug with pause/resume of masked emotes when quickly exiting/re-entering the scene

* Removed all code related to legacy animations

* Missing MaskedEmote.anim.meta

* Merged dev and updated masked emote visibility logic to stop when in gliding state

* - Modified GetTextureWebRequest.cs to request CPU readable textures through new exposed APIs
- Modified glTFast import settings to explicitly request CPU readable textures
- Replaced draco dependency as per glTFast recommendation

* ktx

* Added IgnoreAsyncNaming on GltFastDownloadProviderBase.cs since interface does not follow naming convention

* Fixed bug with remote player not seeing masked emote being played if loads the scene after the emote has been triggered

* Removed proxies where not needed

* Missing generated files

* Removed unused controller

* Updated protocol dependency

* - Fixed masked emote re-triggering on remote clients
- Fixed inconsistencies with masked emote state on remote clients

* Updated protocol dependencies to latest experimental

* - made SCENE_EMOTE_PREFIX_WITH_COLON into a readonly string cast to span only when needed
- Refactored TryCancelMaskedEmote to return a bool as expected (removed StopAndResetMaskedEmote too)
- Only left messageBus.Send() wrapped in the try/catch
- Removed callback from TriggerSceneEmoteAsync and refactored using correct async flow

* Updated shared dependencies to main

Author: Maurizio-dcl

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