[chronik-client] Add chronik-info endpoint to in-node chronik-client

Summary:
Add support for available chronik-info endpoint to in-node chronik-client

Because we do not want to build everything for every different endpoint, rename blockchain_info test to api_endpoints

Add test for chronik-info endpoint before mining more blocks.

Note: we can use the mining more blocks logic to test other endpoints that find blocks, e.g. demonstrating a new blockheight is available.

Test Plan: Check CI result of built chronik tests

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D15118