Provide some more detailed information about inline comments in "transaction.search"

Summary:
Ref T5873. This provides paths and line numbers for inline comments.

This is a touch hacky but I was able to keep it mostly under control.

Test Plan:

• Made inline comments.
• Called API, got path/line information.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T5873

Differential Revision: https://secure.phabricator.com/D18469