Update Maniphest for modular transactions

Summary: Ref T12671. This modernized Maniphest transactions to modular transactions.

Test Plan:

• Create Task
• Edit Task
• Raise Priority
• Change Status
• Merge as a duplicate
• Create Subtask
• Claim Task
• Assign Project
• Move on Workboard
• Set a cover image
• Assign story points
• Change story points
• Generate lots via lipsum
• Bulk edit tasks
• Leave comments
• Award Token

I'm sure I'm missing something.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: hazelyang, Korvin

Maniphest Tasks: T12671

Differential Revision: https://secure.phabricator.com/D17844