[platform] implement platform dnssd apis #5454

Job	Run time
Border Router (mDNSResponder)	29m 11s
Border Router (mDNSResponder)	30m 25s
Border Router (Avahi)	30m 34s
Border Router (Avahi)	30m 34s
Border Router TREL (mDNSResponder)	29m 3s
Border Router TREL (mDNSResponder)	29m 3s
Border Router TREL (Avahi)	29m 2s
Border Router TREL (Avahi)	29m 2s
Border Router MATN (mDNSResponder)	20m 52s
Border Router MATN (mDNSResponder)	23m 9s
Border Router Internet Access Features (mDNSResponder)	23m 53s
Border Router Internet Access Features (mDNSResponder)	23m 53s
Backbone Router	16m 15s
Backbone Router	20m 37s
Border Router TREL with FEATURE_FLAG (avahi)	28m 17s
Border Router TREL with FEATURE_FLAG (avahi)	28m 17s
	7h 2m 7s

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