[Feature Request] Sync Config Filepath Override

[stevensJourney]

It would be great if self-hosted (and possibly all/shared) commands could specify an override for the Sync config file path. We currently support this for the cloud Sync config deploy command

# Supplies an override path instead of the [directory]/sync-config.yaml file.
powersync deploy sync-config --sync-config-file-path=sync.yaml

In particular, this was requested for the powersync validate command here.