Added aliases for cmd inspect flags; added aliases for order_by and group_by

[neilotoole]

• sq inspect: added flag shorthand -C for --catalogs and -S for --schemata.

• SLQ group_by function
  now has a synonym gb, and order_by now has synonym ob.
  These synonyms are experimental. The motivation is to reduce typing, especially the underscore (_)
  in both function names, but it's not clear that the loss of clarity is worth it. Maybe synonyms
  group and order might be better? Feedback welcome.

  # Previously
  $ sq '.payment | .customer_id, sum(.amount) | group_by(.customer_id) | order_by(.customer_id)'
  
  # Now
  $ sq '.payment | .customer_id, sum(.amount) | gb(.customer_id) | ob(.customer_id)'