Limit number of HTLCs in custom channel #3420

Job	Run time
Format check	19s
cross compilation	3m 58s
Compilation check	48s
Docker build check	3m 35s
run itests	8m 42s
run itests postgres	13m 42s
Lint check	2m 22s
migration version check	13s
go mod check	22s
RPC check	1m 18s
run LiT tests	3m 29s
sample configuration check	38s
Sqlc check	29s
test vector check	47s
run unit tests (unit-race)	7m 27s
run unit tests (unit-cover)	2m 28s
run unit tests (unit dbbackend=postgres)	5m 15s
finish	4s
	55m 56s

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