groups: Groups Operation
In kos59125/soracomr: Management of SORACOM SIM cards

Gets, lists or creates groups operation.

list_groups(token, limit, last_evaluated_key, filter)

get_group(token, group_id)

create_group(token, group_name)

delete_group(token, group_id)

`token`	Your API token.
`limit`	Maximum number of response records.
`last_evaluated_key`	The last subscriber's IMSI obtained last time. If given, the API would return subscribers from its next.
`filter`	Filter condition.
`group_id`	The group id.
`group_name`	The group name. For display on the user console.