Get turso db locations (add|remove) parameters from CLI arguments

[athoscouto]

Examples:

> turso group list
NAME     LOCATIONS     
foo      gru (primary)     
> turso group create bar 
Created group bar at gru in 8 seconds.
> turso group locations list bar
gru (primary)
> turso group locations add bar gig
Group bar replicated to gig in 4 seconds.
> turso group locations add bar iad scl
Group bar replicated to 2 locations in 12 seconds.
> turso group locations add bar gig gru
Group bar replicated to 2 locations in 0 seconds.

The last example hints to the user that the replications were successful, where they are actually no-ops.
It should be fixed in the next PRs.

[haaawk]

Probably fixes #616