[eCash dev libraries] [p5 ecash-ops] Clone minimaldata from bitcoinjs

Summary:
T2847

Depends on D12858

This diff clones in the latest version of minimaldata from bitcoinjs. This version is a few commits behind the PSF version. You can see the differences here: https://github.com/christroutner/minimaldata/commits/master

Because these changes involve bringing in bitcoincash-ops, which we have now replaced with ecash-ops, we will do them in this stack.

Test Plan: Confirm this diff is pulling in this repo: https://github.com/bitcoinjs/minimaldata

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Subscribers: emack

Differential Revision: https://reviews.bitcoinabc.org/D12859