[wallet 1/3]: refactor in preparation for group key channel funding #3991

Job	Run time
Compilation check	58s
Docker build check	4m 3s
cross compilation	12m 27s
Format check	20s
run itests	12m 0s
run itests postgres	20m 7s
Lint check	2m 43s
migration version check	9s
go mod check	18s
RPC check	1m 4s
sample configuration check	49s
Sqlc check	36s
test vector check	55s
run unit tests (unit-race)	15m 28s
run unit tests (unit-cover)	2m 7s
run unit tests (unit dbbackend=postgres)	6m 5s
run LiT tests	16m 44s
finish	3s
	1h 36m 56s

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