feat: add multi stream append support #43

Job	Run time
build / Build (11)	1m 37s
build / Build (17)	1m 45s
build / Build (8)	1m 28s
Tests (Previous LTS) / Single node (PersistentSubscriptions)	2m 19s
Tests (Previous LTS) / Cluster (PersistentSubscriptions)	2m 17s
Tests (Previous LTS) / Single node (Telemetry)	1m 53s
Tests (Previous LTS) / Secure (Streams)	2m 9s
Tests (Previous LTS) / Cluster (Streams)	1m 56s
Tests (Previous LTS) / Single node (Streams)	1m 52s
Tests (Previous LTS) / Secure (PersistentSubscriptions)	2m 27s
	19m 43s

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