Hi folks!
I've removed intergrated guile-redis & guile-json in Artanis, and tweaked the
interfaces, so folks may install their prefered version from upstream.

Artanis become more lightweight now.
And this will also alleviate the pain of the packagers.

The CI tests are passed.
https://gitlab.com/hardenedlinux/artanis/-/pipelines/1278224717

The default tested versions in CI are:
guile-json-4.7.3
guile-redis-2.2.0

Tests and comments are welcome!

Best regards.

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