Handle storage metrics > 2GB

[rkistner]

For storage metrics over 2GB, the limit of a 32-bit signed integer is reached, so MongoDB returns the value as a bigint. OpenTelemetry metrics doesn't support bigint, so it just omit those metrics, resulting in no reported value.

This change forces conversion of these metrics to a number. We should not get any loss of precision in any realistic metric values, since number can still accurately store values up to 2^53-1.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2a10383

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

This PR includes changesets to release 6 packages

Name	Type
@powersync/service-core	Patch
@powersync/service-module-mongodb	Patch
@powersync/service-module-mysql	Patch
@powersync/service-module-postgres	Patch
@powersync/service-image	Patch
test-client	Patch

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