Implement Grasberg DAA

Summary: This is fo testing for now.

Test Plan:

ninja check-pow

Reviewers: #bitcoin_abc, majcosta, Fabien

Reviewed By: #bitcoin_abc, majcosta, Fabien

Subscribers: markblundeberg, jhoenicke, bvk, Fabien, majcosta, Mengerian

Differential Revision: https://reviews.bitcoinabc.org/D6981