Use compose-go to build and parse docker-compose files

[rfay]

the compose-spec has moved along significantly in recent years, and there's even a go library to build and parse compose files. https://github.com/compose-spec/compose-go

We can use this instead of running docker-compose config and can probably build the whole file using this technique instead of templating.

[rfay]

DDEV's processing of the docker-compose.*.yaml files can remove this from existing add-on recipes.