[chronik-client] Add in-node ChronikClientNode object and handle standard endpoints

Summary: Add ChronikClientNode object to communicate with in-node instances of the chronik indexer. Initialize with method to conduct getblockchaininfo API call. Replace NNG chronik-client in integration test with ChronikClientNode.

Test Plan: Same as D14915

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D14851