feat: Implement colored output (with `NO_COLOR` support)

Colours sould only be enabled when the terminal supports them.
For example, when redirecting output or piping to cat, there should be no escape sequences.

I believe there needs to be a condition around the pretty method (or maybe it should be handled by tracing_subscriber::fmt):

https://github.com/stackabletech/stackable-cockpit/blob/fe37d494359d91e32ae309a9f6d382b4a486c5a0/rust/stackablectl/src/main.rs#L31

Examples:

stackablectl --log-level=DEBUG stack list > /tmp/stackablectl.stdout       # plain redirect
stackablectl --log-level=DEBUG stack list | cat > /tmp/stackablectl.stdout # pipe through cat
TERM= stackablectl --log-level=DEBUG stack list > /tmp/stackablectl.stdout # explicitly set TERM to nothing

If I open it in VIM, it looks like this:

Inizia in rust/stackablectl/src/main.rs intorno al metodo pretty indicato e confronta se tracing_subscriber::fmt debba occuparsi del rilevamento del terminale. Esegui i comandi stackablectl elencati con l’output reindirizzato e convogliato tramite pipe, incluso con un TERM vuoto, e conferma che l’output non interattivo non contenga sequenze di escape, mentre l’output dei terminali supportati rimanga colorato e NO_COLOR venga rispettato.