Pull request ElementsProject/lightning#4489

add a `funder` plugin

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Range Diff Matrix


6604..6606
6604..6607	6606..6607
6604..6608	6606..6608	6607..6608
6604..6609	6606..6609	6607..6609	6608..6609
6604..6612	6606..6612	6607..6612	6608..6612	6609..6612
6604..6618	6606..6618	6607..6618	6608..6618	6609..6618	6612..6618