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In this commit we add a new case to the main select statement within a channel link. This select statement will serve as a Sipping Bird which will check the network fee rate (as returned by the fee estimator) and compare that to the fee on the commitment transaction. Using the shouldAdjustCommitFee function, we determine if we should update the commitment fee. If so, then we’ll send an UpdateFee message and also trigger a new commitment update. We also add a new unit test: TestChannelLinkUpdateCommitFee to ensure that we update the fee accordingly if the fee increases or decreases by a large portion.