feat: add multi stream append feature#422

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masterkurrent-io/KurrentDB-Client-NodeJS:masterfrom

DEVEX-426-node-js-client-implement-multi-append-with-no-schema-registry-involvedkurrent-io/KurrentDB-Client-NodeJS:DEVEX-426-node-js-client-implement-multi-append-with-no-schema-registry-involvedCopy head branch name to clipboard