Require plain json object as metadata (#348) #117

Job	Run time
build / Build (8)	1m 41s
build / Build (11)	1m 53s
Tests (CI) / load_configuration / load	3s
build / Build (17)	1m 41s
Tests (CI) / Secure (Streams)	2m 12s
Tests (CI) / Cluster (MultiStreamAppend)	2m 8s
Tests (CI) / Secure (PersistentSubscriptions)	2m 24s
Tests (CI) / Cluster (PersistentSubscriptions)	2m 24s
Tests (CI) / Cluster (Streams)	1m 55s
Tests (CI) / Single node (Telemetry)	2m 0s
Tests (CI) / Single node (Streams)	2m 9s
Tests (CI) / Single node (MultiStreamAppend)	2m 4s
Tests (CI) / Single node (PersistentSubscriptions)	2m 18s
	24m 52s

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