feat: add Core Lightning connector

[AaronDewes]

Type of change

• New feature (non-breaking change which adds functionality)

Describe the changes you have made in this PR -

This adds a new connector for Core Lightning (previously called c-lightning).
This is still a rough draft and not usable yet.

Screenshots of the changes (If any) -

TODO

How Has This Been Tested?

TODO

Checklist:

• My code follows the style guidelines of this project and performed a self-review of my own code
• New and existing tests pass locally with my changes
• I checked if I need to make corresponding changes to the documentation (and made those changes if needed)

[bitcoinuser]

Hi, any news on this?

[escapedcat]

Done via #1390