refactor: move `rust/decentraland-godot-lib` to `lib` and `rust/xtask` to root

[leanmendoza]

What ?

• move rust/decentraland-godot-lib to lib
• move rust/xtask to root folder
• rename decentraland-godot-lib to dclgodot
• godot version showed when it opens, 0.1.0-commitXXXXXXXXXXXX and it fallbacks to 0.1.0-timestampXXXXXXX if the repo is not safe

TODO

• [x] test android build
  • [x] because lib name changed, the JNI load in advance doesn't work https://github.com/decentraland/godot-explorer-android-template/commit/0c2592b5ca8371db23f7034ff8727cd4bb1be99f
• [x] test windows build
• [x] test linux build
• [x] test macos build (no livekit, no ffmpeg)
• [x] after merging test docker image
• [x] test ios