cli: add "--force" option

[slint]

To avoid errors like amqp.exceptions.NotFound: Queue.purge: (404) NOT_FOUND - no queue 'stats-record-view' in vhost '/', a --force could be added (similar to invenio index init --force), which would ignore errors.

This is especially useful for setup scripts, which have to "reset" the environment by cleaning up any existing fixtures.

Scenarios to check:

• [x] Create a queue that already exists (shouldn't do anything actually)
• [x] You have already e.g. one queue foo, you have created it (via invenio queues declare), and then you add another queue bar, and you want to create it as well via invenio queues declare (of course, still keep the foo queue)
• [x] You want to delete/purge all the queues, but you are in a partial state: e.g. you have configured foo and bar, but only foo is actually created, and then you want to run invenio queues delete, and end up with no queues at all

[frankois]

Command			Comment
Declare	configured queues not running	:white_check_mark:
	configured queues running	:white_check_mark:
	specific queue already running	:white_check_mark:
	partial state	:white_check_mark:
Delete	configured queues running	:white_check_mark:
	configured queues not running	:white_check_mark:
	specific queues not running	:white_check_mark:
	in partial state	:white_check_mark:
Purge	configured queues running	:white_check_mark:
	specific queues not running	:x:	amqp.exceptions.NotFound: Queue.purge: (404) NOT_FOUND - no queue 'stats-record-view' in vhost '/'
	configured queues not running	:x:	=
	in partial state	:x:	=

[slint]

Closed via #11