Make 404 errors consistent with other error responses

[simolus3]

The sync service has custom error types used to respond with error descriptions, like:

{"error":{"code":"PSYNC_S2106","status":401,"description":"Authentication required","name":"AuthorizationError"}}

When requesting an endpoint that doesn't exist, the sync service also responds with an error. That response has an incompatible structure though:

{"message":"Route GET:/foo/bar not found","error":"Not Found","statusCode":404}

That response manages to crash the error handler in the Dart SDK, leading to a confusing error message there.

This PR installs a custom 404 handler on fastify to ensure the responses are consistent.

[changeset-bot]

🦋 Changeset detected

Latest commit: d30f7d6

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

This PR includes changesets to release 16 packages

Name	Type
@powersync/service-errors	Patch
@powersync/service-core	Patch
@powersync/lib-services-framework	Patch
@powersync/service-core-tests	Patch
@powersync/service-module-core	Patch
@powersync/service-module-mongodb-storage	Patch
@powersync/service-module-mongodb	Patch
@powersync/service-module-mysql	Patch
@powersync/service-module-postgres-storage	Patch
@powersync/service-module-postgres	Patch
@powersync/service-image	Patch
test-client	Patch
@powersync/service-rsocket-router	Patch
@powersync/lib-service-mongodb	Patch
@powersync/lib-service-postgres	Patch
@powersync/service-schema	Patch

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