Use PQueue inside EditGraphQL subscriptions

[scott-rc]

This adds a PQueue inside EditGraphQL subscriptions so that we:

1. Process messages in the order we receive them
2. Never process messages in parallel

This allows our GraphQL subscription handlers to be async while still ensuring they run in the expected order. This also helps us write tests where we can await the handler of a message rather than watching for external state to change.

None of our current subscriptions need to process messages in parallel, in fact filesync already uses a PQueue internal to prevent this from happening. If we ever need to process messages in parallel in the future, we can add a concurrency option.

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Latest commit: 2736405

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