Allow EditEngine Conduit endpoints to accept object IDs and monograms

Summary:
Ref T9132. This is a quality-of-life improvement for new application.edit endpoints.

Instead of strictly requiring PHIDs, allow IDs or monograms. This primarily makes these endpoints easier to test and use.

Test Plan: Edited objects via API by passing IDs, PHIDs and monograms.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9132

Differential Revision: https://secure.phabricator.com/D14600