Implemented the new mutable subscriptions API

[cloutiertyler]

Description of Changes

Quite a large change, although much of the diff derives from the fact that I was restructuring in a way that would allow me to implement the new subscription API while hiding certain things which should not have been public per this ticket: #127

This PR is based on: #132

API

• This removes the old manner of subscribing in favor of the new incremental subscriptions implementation.

Requires SpacetimeDB PRs

clockworklabs/SpacetimeDB#2224

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Latest commit: 741b9dd

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npm i https://pkg.pr.new/@clockworklabs/spacetimedb-sdk@135

commit: 619718c