Limit number of HTLCs in custom channel #3448

Job	Run time
Compilation check	41s
Format check	21s
Docker build check	3m 35s
cross compilation	12m 56s
run itests	11m 2s
run itests postgres	19m 27s
Lint check	2m 6s
migration version check	11s
go mod check	23s
RPC check	1m 10s
run LiT tests	13m 22s
sample configuration check	3m 42s
Sqlc check	35s
test vector check	48s
run unit tests (unit-race)	9m 28s
run unit tests (unit-cover)	1m 50s
run unit tests (unit dbbackend=postgres)	5m 54s
finish	3s
	1h 27m 34s

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