Convert Publisher to separate new/launch functions

Per discussion on !1064 (merged).

(Also, new() should by synchronous.)

added Next Onion Services: Basic Service labels

assigned to @gabi-250

changed the description

mentioned in merge request !1604 (merged)

added Doing label

removed Doing label

removed Next label

added Doing label

mentioned in merge request !1608 (merged)

added Needs Review label

removed Doing label

mentioned in commit c6de23db

closed with commit 2496ad52

closed with merge request !1608 (merged)

mentioned in commit 4815c395