Implemented an entity browser

[AnsisMalins]

What does this PR change?

This change adds an entity browser window under Arch/View/Entities in the top menu in Unity editor. It allows you to compose any query and view the list of matching entities and their components in real time.

How to test the changes?

1. Open the project in Unity editor
2. Open the entity browser
3. Enter play mode
4. Enter a query and view the list of entities

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	49508a2
Logs	https://github.com/decentraland/unity-explorer/actions/runs/12301722996
Download Windows	https://github.com/decentraland/unity-explorer/suites/31996852454/artifacts/2313446556
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/entity-browser/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/31996852454/artifacts/2313813320
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/entity-browser/Decentraland_macos.zip
Built on	2024-12-12T19:51:34Z

[mikhail-dcl]

It already looks very cool in the current shape 👍 but I have to proposals to make it more useful

[QThund]

Nice tool as a first step. I guess you already have many ideas for future improvements, the most obvious to me would be adding a search box in each filter (all, none, etc.) so we can easily find the component we want.

@mikhail-dcl is on holiday.

[dalkia]

Amazing tool, thanks!!