feat(mon-pages): add an autocomplete column filter

A funnel over the values of a field only the server knows: picks are
chips against one of the registered autocompleters, committed as the
single "one_of" condition those fields accept.

The suggestion sources go through the autocompleter the classic
filters already use. Labels are asked for as the core knows them,
since the Setup world would offer labels no monitored object carries
yet. Tags take two idents, one knowing the groups and one the tags of
a named group, which the source joins back into the pair a condition
carries.

CMK-38149

Change-Id: I9694fdb957ef408bf194097d3a7ca8f56e1c0ceb