[guix] Build chronik plugin on linux

Summary:
This adds chronik plugin support to the Linux releases. I decided to not make it a separated build but we can still mark the feature as experimental as needed.

Depends on D16954.

Test Plan:

@bot guix-linux

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D16955