[Cashtab] [chronik tx history p4] move parseChronikTx from cashMethods to chronik

Summary:
T2447

Depends on D12052

Move the parseChronikTx function out of cashMethods and into the chronik file. This function will be expanded to fully parse tx history using chronik.

Test Plan:
npm test and unit tests still work after reshuffling location
npm start and no issues

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D12053