feat: add multi stream append support #68

Job	Run time
build / Build (11)	1m 31s
build / Build (17)	1m 27s
build / Build (8)	1m 12s
Tests (Previous LTS) / load_configuration / load	4s
Tests (Previous LTS) / Secure (Streams)	1m 41s
Tests (Previous LTS) / Single node (PersistentSubscriptions)	1m 46s
Tests (Previous LTS) / Single node (Streams)	1m 49s
Tests (Previous LTS) / Secure (PersistentSubscriptions)	2m 4s
Tests (Previous LTS) / Cluster (Streams)	1m 33s
Tests (Previous LTS) / Single node (Telemetry)	1m 26s
Tests (Previous LTS) / Cluster (PersistentSubscriptions)	1m 50s
Tests (Previous LTS) / Single node (MultiStreamAppend)	1m 28s
Tests (Previous LTS) / Cluster (MultiStreamAppend)	1m 57s
	19m 48s

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