Add a SearchEngine for Calendar import logs

Summary:
Ref T10747.

• Look at more than 25 logs!
• Review your favorite logs. Heartwarming! :)

Test Plan: Looked at logs. Wow! Logs!

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10747

Differential Revision: https://secure.phabricator.com/D16719