[chronik-client] Support for confirmedTxs and unconfirmedTxs in script

Summary:
T3441

Neglected to add these when initially did the script endpoints.

Test Plan: CI

Reviewers: #bitcoin_abc, tobias_ruck, Fabien

Reviewed By: #bitcoin_abc, tobias_ruck, Fabien

Subscribers: Fabien, tobias_ruck

Differential Revision: https://reviews.bitcoinabc.org/D15668