Prepare for custom channels (lnd v0.18.4-beta) #1889

Job	Run time
integration test	20m 31s
backend build on ubuntu-latest	9m 6s
frontend tests on ubuntu-latest	4m 53s
check commits	8m 53s
backend build on windows-latest	11m 16s
frontend tests on windows-latest	7m 44s
backend build on macOS-latest	7m 47s
lint	3m 34s
frontend tests on macOS-latest	4m 38s
RPC proto compilation check	8m 50s
check release notes updated	3s
unit tests	5m 5s
unit-race	6m 1s
	1h 38m 21s

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