Limit number of HTLCs in custom channel #3419

Job	Run time
cross compilation	3m 56s
Compilation check	43s
Format check	20s
Docker build check	3m 32s
run itests	8m 38s
run itests postgres	13m 56s
Lint check	2m 26s
migration version check	12s
go mod check	22s
RPC check	1m 13s
run LiT tests	3m 43s
sample configuration check	33s
Sqlc check	2m 57s
test vector check	44s
run unit tests (unit-race)	7m 25s
run unit tests (unit-cover)	2m 18s
run unit tests (unit dbbackend=postgres)	5m 29s
finish	3s
	58m 30s

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