[mock-chronik-client] Support setting and getting tx history by lokadId

Summary:
Depends on D16380

This feature will be used by Cashtab to support NFT trading. Need to support in the mock for Cashtab tests.

Test Plan: npm test, CI to confirm does not break other apps using this dependency

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D16382