Add support for the `type` field in PubNubMembershipMetadata (#194) #719

Job	Run time
Validate demo application	1m 23s
Validate .pubnub.yml	13s
Validate package managers (CocoaPods)	5m 50s
Validate package managers (Swift Package Manager)	2m 18s
Validations	3s
	9m 47s

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