Adding support to the BuddyPress Group Meta commands:
$ wp bp group meta
usage: wp bp group meta add <id> <key> [<value>] [--format=<format>]
or: wp bp group meta delete <id> [<key>] [<value>] [--all]
or: wp bp group meta get <id> <key> [--format=<format>]
or: wp bp group meta list <id> [--keys=<keys>] [--fields=<fields>] [--format=<format>] [--orderby=<fields>] [--order=<order>]
or: wp bp group meta patch <action> <id> <key> <key-path>... [<value>] [--format=<format>]
or: wp bp group meta pluck <id> <key> <key-path>... [--format=<format>]
or: wp bp group meta update <id> <key> [<value>] [--format=<format>]
Adding support to the BuddyPress Group Meta commands:
see #74