Configurable service limits

[rkistner]

Add configurable parameters, with defaults matching the previous behavior:

1. Max number of buckets and max number of parameter query results. Currently both limited to 1000 to match previous behavior, but parameter query results can have a higher limit in the future.
2. Max number of connections (default 200).
3. Max data fetch concurrency (default 10).
4. Max storage db pool size (default 8).

The general idea is to allow serving more connections per process/container, for use cases where the number of buckets and data volumes are smaller.

[changeset-bot]

🦋 Changeset detected

Latest commit: 7f8d223

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 12 packages

Name	Type
@powersync/service-module-postgres-storage	Minor
@powersync/service-module-mongodb-storage	Minor
@powersync/service-core-tests	Minor
@powersync/service-core	Minor
@powersync/lib-service-postgres	Minor
@powersync/lib-service-mongodb	Minor
@powersync/service-types	Minor
@powersync/service-image	Minor
@powersync/service-module-mongodb	Patch
@powersync/service-module-mysql	Patch
@powersync/service-module-postgres	Patch
test-client	Patch

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[stevensJourney]

Happy with the changes