feat: add multi stream append support #52

Job	Run time
build / Build (17)	1m 27s
build / Build (11)	1m 37s
build / Build (8)	1m 27s
Tests (Previous LTS) / load_configuration / load	2s
Tests (Previous LTS) / Secure (PersistentSubscriptions)	2m 8s
Tests (Previous LTS) / Cluster (MultiStreamAppend)	1m 45s
Tests (Previous LTS) / Cluster (Streams)	1m 56s
Tests (Previous LTS) / Cluster (PersistentSubscriptions)	2m 6s
Tests (Previous LTS) / Secure (Streams)	1m 57s
Tests (Previous LTS) / Single node (Telemetry)	1m 48s
Tests (Previous LTS) / Single node (PersistentSubscriptions)	2m 6s
Tests (Previous LTS) / Single node (Streams)	1m 54s
Tests (Previous LTS) / Single node (MultiStreamAppend)	1m 42s
	21m 55s

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