[rfq]: add validation to `AddAssetBuyOrder` and `AddAssetSellOrder` RPCs #3437

Job	Run time
RPC check	1m 12s
test vector check	53s
cross compilation	4m 42s
Compilation check	43s
Format check	27s
Docker build check	3m 45s
run itests	8m 41s
Lint check	2m 31s
migration version check	12s
go mod check	20s
sample configuration check	37s
Sqlc check	30s
run unit tests (unit-race)	9m 24s
run itests postgres	17m 12s
run unit tests (unit-cover)	3m 0s
run unit tests (unit dbbackend=postgres)	5m 40s
run LiT tests	11m 18s
finish	3s
	1h 11m 10s

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