[chronik] Upgrade karyon_jsonrpc library to 0.2.0

Summary:
This is a patch submitted on Github:
https://github.com/Bitcoin-ABC/bitcoin-abc/pull/560

This upgrade introduces support for adding custom service names and method names for the RPC services. It also removes the karyon_net library from the dependency tree.

Test Plan:
With Chronik enabled:
ninja check-functional

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D17396