Implement YSweetConnection class in SDK

[paulgb]

This PR:

• Adds a DocConnection class in the SDK, which wraps a ClientToken and can be used to make REST requests to a document.
• Refactors HTTP-level concerns into an HttpClient class
• Modifies the DocumentManager.getDocAsUpdate and .updateDoc methods to work via a DocConnection. This ensures that in a multi-node environment, application data goes directly to the relevant y-sweet server instead of traveling through the y-sweet API server.
• Adds a test.

In the process, it modifies how authorization works in Y-Sweet so that a server token can be used to access any document.

Design doc: https://docs.google.com/document/d/10O4-i9sxUL5-bWjIYqgxbStJGqNCVLfP411J9x-fTFM/edit

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[paulgb]

@greptileai

[paulgb]

Looks great! Nice job!

Two things:

• I suppose this should get a major or minor version update? This is a breaking change as it requires the latest version of the y-sweet server, right? (Requires baseUrl on client token)
• We'll need the same changes brought to the python SDK before Athena is good to go. Those will be in a follow up?

• If we were >= 1.0.0, it would be a major version bump, but since we are < 1.0.0 it will be a minor version bump.
• Yes, I'll update the Python SDK next.