feat: add multi stream append support #53

Job	Run time
build / Build (8)	1m 47s
build / Build (17)	1m 33s
build / Build (11)	1m 31s
Tests (Previous LTS) / load_configuration / load	2s
Tests (Previous LTS) / Secure (PersistentSubscriptions)	2m 27s
Tests (Previous LTS) / Single node (Streams)	1m 59s
Tests (Previous LTS) / Secure (Streams)	2m 4s
Tests (Previous LTS) / Single node (PersistentSubscriptions)	2m 9s
Tests (Previous LTS) / Cluster (PersistentSubscriptions)	2m 16s
Tests (Previous LTS) / Single node (MultiStreamAppend)	1m 57s
Tests (Previous LTS) / Cluster (MultiStreamAppend)	1m 48s
Tests (Previous LTS) / Single node (Telemetry)	1m 47s
Tests (Previous LTS) / Cluster (Streams)	1m 55s
	23m 15s

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