Prepare for custom channels (lnd v0.18.4-beta) #1879

Job	Run time
check commits	7m 23s
frontend tests on ubuntu-latest	4m 56s
backend build on ubuntu-latest	8m 53s
frontend tests on windows-latest	5m 20s
integration test	14m 41s
backend build on windows-latest	8m 38s
frontend tests on macOS-latest	5m 11s
lint	3m 26s
backend build on macOS-latest	8m 27s
RPC proto compilation check	9m 2s
check release notes updated	3s
unit tests	5m 2s
unit-race	6m 6s
	1h 27m 8s

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