Add Godot client support for Blackholio

This issue tracks reimplementing the work from stale PR #3128, which has been closed because it is too far out of date to merge directly.

Original pull request

• PR #3128: Add godot client to blackholio
• Original author: @krazyjakee

What the original PR was trying to do

Description of Changes Migrated from: https://github.com/clockworklabs/Blackholio/pull/29 Adds a Godot client - Godot 4.4.1 stable - Logic is as close to the unity client as possible. - Uses Godot compatibility-mode to support web/websocket deployment - Uses the Godot spacetimedb sdk https://github.com/flametime/Godot-SpacetimeDB-SDK Expected complexity level and risk 1 out of 5 (Trivial) Testing - Run a local blackholio server - launch the Godot client in godot 4.4.1 - press F5 (Play)

Closure context

• @krazyjakee The Godot SDK is now actively being worked on. I'm going to close this PR for now, but with an issue to reimplement it and a link back to this PR.

Reimplementation notes

• Reimplement this work on top of current master in a new PR.
• Keep the original PR linked as historical context and as a source of useful implementation ideas where still relevant.

Start by reviewing stale PR #3128 and the current master branch, then inspect the existing Blackholio client implementation and Godot-SpacetimeDB-SDK context. Run a local Blackholio server with Godot 4.4.1 in compatibility mode, launch the client with F5, and verify the reimplemented client works against the current server.