feat: add multi stream append support#330

w1am merged 16 commits into

trunkkurrent-io/KurrentDB-Client-Java:trunkfrom

DEVEX-423-java-client-implement-multi-append-with-no-schema-registry-involvedkurrent-io/KurrentDB-Client-Java:DEVEX-423-java-client-implement-multi-append-with-no-schema-registry-involvedCopy head branch name to clipboard