add sim-ln service

[pinheadmz]

This is a WIP, pushing commits slowly to bang on CI

Strategy:

• [x] Move the backend/compose/services directory up to src/
• [x] Add graphml options to add those services only when needed
• [x] refactor the BaseService to accomodate both backends
• [x] add sim-ln service that can be optionally added to any warnet with either backend
• [x] export network data into the simln container so it can do its thing

TODO:

• [ ] DOCS (follow up PR)