Er, why can’t you run a MongoDB replica set on your M1?
I mean, I wouldn’t recommend running a ReplicaSet on the same host on any production host (it defeats the purpose), but for testing, I’ve run a sharded cluster w/ 3 replicas per shard…
You might consider it if you have to ship with a lot of pre-loaded data ("vanilla" data), as it'd be easier to do all those inserts/BCP executions just once on a local network and not over the internet.
Omnisharp is mainly community members getting together to produce it. The idea was originally devised by Jason Imison. A couple of MS guys wanted to get involved and now VSCode uses Omnisharp under the hood. So whilst there are a couple of MS guys involved and VSCode uses it, Ominsharp is a community project