'st2 <thing> delete' should accept multiple positional args for removal

Initially comes from a release testing when specific testing pack installs 100+ action aliases and we have no way to delete them in a bulky way.

The following construct fails because st2 action-alias delete can only accept single positional arg as id:

st2 action-alias delete pack.alias1 pack.alias2

Better example that ideally should work:

st2 action-alias delete $(st2 action-alias list -p chatops_tests -a id | awk '{print $2}')

The general CLI improvement here and helpful from user's perspective would be allowing multiple IDs for removal.
From what I remember, only st2 pack delete 1 2 3 4 5 only works this way.

Affected CLI:

st2 action delete
st2 action-alias delete
st2 key delete
st2 policy delete
...
and so on

Start at the CLI entry points for st2 action delete, st2 action-alias delete, st2 key delete, st2 policy delete, and the existing st2 pack delete behavior. Compare how positional IDs are parsed and verify that each affected delete command accepts multiple IDs, including the bulk action-alias example.