This proposal:

1. Adds the capacity-based vault revenue distribution as outlined in https://interlay.subsquare.io/post/13
2. Updates the Polkadot dependencies to v0.9.37

Updates Kintsugi to the latest runtime (breaking).

For more details, please see the following:

https://github.com/interlay/interbtc/releases/tag/1.21.10
https://github.com/interlay/interbtc/compare/1.20.1...1.21.10

The latest compatible clients release for this version is v1.19.7:

https://github.com/interlay/interbtc-clients/releases/tag/1.19.7