cmd/commands: add validation for MPP parameters #16252

Job	Run time
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
cross compilation	31m 55s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
lint code	4m 17s
check commits	6m 21s
run macOS itest	49m 1s
RPC and mobile compilation check	2m 30s
check release notes updated	4s
sample configuration check	55s
Sqlc check	2m 46s
run unit tests (btcd unit-cover)	17m 24s
run ubuntu itests (btcd, backend=btcd cover=1)	28m 42s
run unit tests (unit tags="kvdb_etcd")	19m 30s
run windows itest	7m 4s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	37m 48s
run unit tests (unit tags="kvdb_postgres")	18m 15s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	38m 14s
run unit tests (unit tags="kvdb_sqlite")	17m 42s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	37m 36s
run unit tests (btcd unit-race)	36m 31s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	52m 21s
run unit tests (unit-module)	1m 5s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 10m 6s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	39m 14s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 11m 0s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	41m 15s
run ubuntu itests (neutrino, backend=neutrino cover=1)	35m 37s
finish	4s
	11h 7m 26s

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