Summary: Fixes T7458. Integrates #diviner into #applicationsearch by indexing `DivinerLiveBook` and `DivinerLiveSymbol` search documents. Depends on D13157.
Test Plan: Ran `./bin/search index --all --type BOOK` and `./bin/search index --all --type ATOM` and then searched for various symbols via global search.
Reviewers: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Maniphest Tasks: T7458
Differential Revision: https://secure.phabricator.com/D13090
