The `build` subcommand can now take in any number of recipe files and
will build them all in parallel. Along with this new ability, I've added
a way to easily distinguish which part of the build log belongs to which
recipe. Check out the `docker_build` action of this PR for an example.

## Tasks
- [x] Make build log follow same pattern as normal logs to keep things
consistent
- [x] Update color ranges based on @xynydev 's feedback
- [x] Deal with ANSI control characters in log output
- [x] Add [`indicatif`](https://crates.io/crates/indicatif) to make logs
look nicer
- [x] Add ability to print logs to a file
This updates the `template` subcommand to be `generate`. The `template`
usage will continue to work as an alias to `generate`. A new `switch`
command is added that will manage both `rpm-ostree rebase` and
`rpm-ostree upgrade` and is fully replacing the respective subcommands
as a breaking change.
The new `switch` command is under the feature flag `switch` and will
currently only build for the `main` branch builds until it is moved as a
default feature (`v0.9.0`).
Closes#159