Feat: local scene development multiplayer

[NickKhalow]

What does this PR change?

• Added multiplayer testing capabilities for CreatorHub mode
• Extra added support for multiple profiles, each new instance associated with a new profile slot that persists after instance's shutdown
• Implemented native named mutex, process name info fetching and memory mapped files because IL2CPP doesn't support it

How to test the changes?

1. Launch your local scene with 2 instances of Explorer client or more via CreatorHub
2. On start of a new instance see auth screen is associated with a new profile. Each new instance has its own profile slot
3. Verify you can interact between instances in multiplayer

Validate this flow on Windows and MacOS (Intel and Arm64)

Our Code Review Standards

https://github.com/decentraland/unity-renderer/blob/master/docs/code-review-standards.md

[github-actions]

Windows and Mac build successfull in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	a5f9344
Logs	https://github.com/decentraland/unity-explorer/actions/runs/13370288202
Download Windows	https://github.com/decentraland/unity-explorer/suites/34484812170/artifacts/2603127423
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/feat/local-scene-development-multiplayer/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/34484812170/artifacts/2603110932
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/feat/local-scene-development-multiplayer/Decentraland_macos.zip
Built on	2025-02-17T12:57:38Z

[Ludmilafantaniella]

✅ Approved

I tested the following scenarios:

• Created 5 new instances (from the 5 accounts I have across social and web3).
• All instances sync correctly with each other, including emotes, chat, and passports.
• If I close an instance and reopen it, the account data persists as expected.

Everything is working as intended! ✅

5Instances.mp4

Regressions for this ticket had been performed in order to verify that the normal flow is working as expected:

• ✔️ Log In/Log Out
• ✔️ Backpack and wearables in world
• ✔️ Emotes in world and in backpack
• ✔️ Teleport with map/coordinates/Jump In
  • The Inn
  • Metadynelabs world - Pravus World
  • Metagamimall
  • Casa Roustan
  • Live Event Scenes
• ✔️ Chat and multiplayer
• ✔️ Profile card
• ✔️ Camera
• ✔️ Skybox

[dalkia]

I would suggest setting up a syncEntity scene to confirm that multiplayer is working correctly