Tracking: interoperability bugs when making offer payments

[orbitalturtle]

I've been testing offer payments with our new lndk-cli pay-offer command: https://github.com/lndk-org/lndk/pull/91

Just using this issue to keep tabs on some problems we've encountered when making offer payments to various lightning implementations.

Payment to CLN offer:

• [x] https://github.com/ElementsProject/lightning/issues/7110
• [x] https://github.com/ElementsProject/lightning/issues/6588 Not 100% if this was a config option issue on my part or... something else.

Payment to LDK-sample offer:

• [x] https://github.com/lightningdevkit/rust-lightning/issues/2893
• [x] https://github.com/lightningdevkit/rust-lightning/pull/2936
  • This bug is now fixed! Once rust-lightning v122 is out and ldk-sample supports it, we can again try to make a payment to a ldk-sample offer with Eclair or CLN as the introduction node.