Sort containees by type first, then by name

[thediveo]

When using devcontainers, their container names might end up being sorted after the often multiple top-level processes inside this container: this makes it harder to quickly spot the container name after a wall of generic process names, such as "bash and "node".

Thus, sort containees not only lexicographically by their names, but sort them by their types first, such as in order of higher to lower precedence:

1. containers (regardless of engine type)
2. processes
3. bind-mounts