refactor: implement sign-in with decentraland.org/auth

[leanmendoza]

Fix #324 Fix https://github.com/decentraland/godot-explorer/issues/276

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 1.75439% with 168 lines in your changes are missing coverage. Please review.

Project coverage is 46.71%. Comparing base (32dc9db) to head (d87bacb).

Files	Patch %	Lines
...and-godot-lib/src/auth/decentraland_auth_server.rs	0.00%	145 Missing :warning:
...t/decentraland-godot-lib/src/auth/auth_identity.rs	7.69%	12 Missing :warning:
...ntraland-godot-lib/src/auth/dcl_player_identity.rs	0.00%	5 Missing :warning:
...t/decentraland-godot-lib/src/auth/remote_wallet.rs	0.00%	4 Missing :warning:
...raland-godot-lib/src/dcl/js/ethereum_controller.rs	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #325 +/- ## ========================================== + Coverage 46.55% 46.71% +0.15% ========================================== Files 155 155 Lines 19086 19034 -52 ========================================== + Hits 8886 8892 +6 + Misses 10200 10142 -58 ```

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