[chronik-client] Support for script endpoints
Summary: Add support for script endpoints for ChronikClientNode in chronik-client module
Test Plan: CI or see D14915
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Subscribers: PiRK, tobias_ruck
Differential Revision: https://reviews.bitcoinabc.org/D15392