The current services in our seqcol implementation are not asynchronous

[waterflow80]

The services in our seqcol implementation, such as the ingestion, the comparison, and the fetching, are not implemented asynchronously.
This will have a bad effect especially when calling the ingestion process, because it may take up to some minutes depending on the assembly's size and the internet connection, and this will force other users to wait unnecessary time when executing other requests at the same time.

So, we need to make each call/invocation work asynchronously (work in parallel).