[eCash dev libraries] [p4 ecash-ops] Adding OP_CODE from the actual published version of the repo

Summary:
T2847

Depends on D12857

Digging into the actual latest publish version of this on npm, I found this PR: https://github.com/christroutner/bitcoincash-ops/commit/0041f2d945aa0e893fbbb5c2ebdf6254f6ff0555

Adding this op code to match what ecashjs-lib is currently using

Test Plan:
Compare this change to index.js with the PR at https://github.com/christroutner/bitcoincash-ops/commit/0041f2d945aa0e893fbbb5c2ebdf6254f6ff0555

Confirm they are the same change

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D12858