feat: add multi stream append support (#330) #69

Job	Run time
build / Build (11)	1m 24s
build / Build (8)	1m 23s
build / Build (17)	1m 14s
Tests (Previous LTS) / load_configuration / load	4s
Tests (Previous LTS) / Secure (PersistentSubscriptions)	1m 57s
Tests (Previous LTS) / Secure (Streams)	1m 50s
Tests (Previous LTS) / Single node (Streams)	1m 37s
Tests (Previous LTS) / Single node (PersistentSubscriptions)	1m 56s
Tests (Previous LTS) / Single node (MultiStreamAppend)	1m 39s
Tests (Previous LTS) / Cluster (Streams)	1m 45s
Tests (Previous LTS) / Single node (Telemetry)	1m 39s
Tests (Previous LTS) / Cluster (PersistentSubscriptions)	2m 4s
Tests (Previous LTS) / Cluster (MultiStreamAppend)	1m 30s
	20m 2s

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