Sharedb connection rework

[kpal81xd]

Fixes

• Folded private methods into callbacks directly
• Uses a promise lock instead of a queue for queued messages

[Copilot]

Pull Request Overview

This PR refactors the ShareDB connection implementation by eliminating private methods in favor of inline callbacks and replacing the message queue with a promise-based locking mechanism. The changes consolidate ShareDB type registration from a separate module into the connection file and introduce a new Deferred utility class.

Key Changes:

• Replaced message queue (_sendQueue) with promise-based locking (_sendPromise) using a new Deferred class
• Inlined private event handler methods (_onConnect, _onError, etc.) directly into event listener callbacks
• Moved ShareDB type registration from sharedb.ts into connection.ts

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/sharedb.ts	Removed standalone ShareDB configuration module
src/realtime/connection.ts	Refactored connection handling with inline callbacks and promise-based message sending
src/deferred.ts	Added new utility class for creating deferred promises

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