[message] add API functions to enable multicast looping of a message #20

Job	Run time
BR (mDNSResponder, TREL=0)	2m 4s
BR (mDNSResponder, TREL=1)	1m 45s
BR MATN (mDNSResponder, TREL=0)	2m 6s
BR LowPower (mDNSResponder, TREL=0)	2m 5s
BR nat64 openthread (mDNSResponder, TREL=0)	2m 4s
BR (avahi, TREL=0)	2m 6s
BR (avahi, TREL=1)	2m 4s
BR core firewall (avahi, TREL=0)	2m 5s
backbone-router	2m 6s
upload-coverage	1s
delete-coverage-artifacts	1s
	18m 27s

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