Reuse connection only after the entity metadatas are registered

[GaaraZhu]

This line of code will return a connection right after it's created as step one of createConnection in line 16, but step two buildMetadatas may not be finished yet. In that case the connection will throw an error when trying to get entity repository.

To reproduce it, trigger two async init operations on a new new EventStore(config.dbConnections.eventStore as never)

const eventStoreRepo = new EventStoreRepoTypeOrm(config.dbConnections.eventStore as never)
eventStoreRepo.init()
eventStoreRepo.init()

Error:

Solutions:

• reuse the connection only after the entity metadatas are registered

• init the repositories outside only once at a time