feat: add multi stream append support #53

Job	Run time
build / Build (11)	1m 30s
build / Build (17)	1m 27s
Tests (CI) / load_configuration / load	3s
build / Build (8)	1m 31s
Tests (CI) / Single node (Streams)	1m 56s
Tests (CI) / Cluster (MultiStreamAppend)	2m 16s
Tests (CI) / Single node (PersistentSubscriptions)	2m 15s
Tests (CI) / Single node (Telemetry)	2m 9s
Tests (CI) / Cluster (Streams)	2m 1s
Tests (CI) / Secure (Streams)	2m 7s
Tests (CI) / Cluster (PersistentSubscriptions)	2m 27s
Tests (CI) / Secure (PersistentSubscriptions)	2m 17s
Tests (CI) / Single node (MultiStreamAppend)	1m 50s
	23m 49s

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