chore (client): prioritize UI queries over Satellite queries

[kevin-dp]

This PR modifies the generic DB adapter and the capacitor-sqlite DB adapter to use a priority-aware mutex such that UI queries have higher priority than Satellite queries.

[linear[bot]]

VAX-1373 Priority-aware mutex

Implement a priority-aware mutex such that we can prioritize the UI over Satellite.

[KyleAMathews]

👋 we've been working the last month on a rebuild of the Electric server over at a temporary repo https://github.com/electric-sql/electric-next/

You can read more about why we made the decision at https://next.electric-sql.com/about

We're really excited about all the new possibilities the new server brings and we hope you'll check it out soon and give us your feedback.

We're now moving the temporary repo back here. As part of that migration we're closing all the old issues and PRs. We really appreciate you taking the time to investigate and create this improvement!