R1:4bba3fd4c147

Fully modularize DestructionEngine

Summary: Ref T9979. Convert all DestructionEngine behaviors to extensions.

Test Plan:
{F1033244}

Destroyed an object, verifying:

- Herald transcripts were destroyed;
- edges were destroyed;
- flags were destroyed;
- tokens were destroyed;
- transactions were destroyed;
- worker tasks were cancelled.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9979

Differential Revision: https://secure.phabricator.com/D14832