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b73a6e2c61
In this commit, we thread through the necessary state to allow users to set a max shard amount. If this value is set, then this'll effectively serve as a ceiling for all our split attempts. If we need to split, we'll first try to use `paymentAmt/2`, if that's bigger than `MaxShardAmt, then we'll use the latter instead. Ideally in the future we have a dynamic way to automatically set both the `MaxShardAmt` as well as `MaxParts` for users. Until then exposing these two new fields will allow us to experiment with setting them automatically using the RPC interface, and also give users a bit more control over how we attempt to route payments, akin to coin control for on-chain payments. Fixes #4730