KIP-173 — Add prefix to StreamsConfig to enable setting default internal topic configs

Accepted Kafka 1.0 Streams

KIP-173 adds a `topic.` prefix to `StreamsConfig` so any property starting with that prefix is forwarded as a default topic config when Kafka Streams creates internal topics (repartition, changelog). Previously there was no way to set default topic-level configs (e.g. `topic.replication.factor`, `topic.min.insync.replicas`) globally for all internally managed topics without using the cumbersome `StateStoreSupplier` API.

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