Implement authentication

[changesbyjames]

In the critter capture club POC, I used simple shared key authentication for "subscribing for to a feed". While that would probably be fine, we also need a general purpose way for services to talk to other services. I think it's best to do private/public key authentication with HMAC signatures.

My preference here would be to have the abstracted away in the trpc server & client so we don't really have to think about it.

[linear]

ALV-14 Implement authentication

In the critter capture club POC, I used simple shared key authentication for "subscribing for to a feed". While that would probably be fine, we also need a general purpose way for services to talk to other services. I think it's best to do private/public key authentication with HMAC signatures.

My preference here would be to have the abstracted away in the trpc server & client so we don't really have to think about it.