In enclave builder, autogenerate service name from image

[mieubrisse]

Background & motivation

Right now it's really nice to be able to graphically configure services, but it's a bit tedious to fill out everything so I'm interested in pulling down that tedium. Filling out the service name is one such thing we don't strictly need the user to do.

Desired behaviour

1. When adding a service, the first thing the user fills out is the image
2. We try to generate a name based on the image, e.g. postgres -> postgres, michaelhosna/adminer -> adminer, ethereum/go-ethereum -> go-ethereum.
3. If there's already a service with the desired name, append the next highest number (e.g. adminer2)

How important is this to you?

Nice to have; this feature would make using Kurtosis more enjoyable.

What area of the product does this pertain to?

Frontend: the Graphical User Interface, including the Enclave Manager