lexicons/ci: introduce pipeline query xrpc lexicons
Using `sh.tangled.ci.*` instead of `sh.tangled.pipeline.*` following
lexicon style guidelines. Since we need both 'pipeline' and 'workflow'
objects, we use different group namespace 'ci'.
I would prefer `ci.temp.*` to be more explicit, but that's not possible
with current lexgen's behavior. It sets filename using last two words
which allows duplicates.
Signed-off-by: Seongmin Lee <git@boltless.me>