routing: add RouteOrigin interface for multi-source pathfinding#10764

calvinrzachman wants to merge 4 commits intolightningnetwork:elle-base-branch-payment-servicelightningnetwork/lnd:elle-base-branch-payment-servicefrom

calvinrzachman:route-origin-interfacecalvinrzachman/lnd:route-origin-interfaceCopy head branch name to clipboard