KIP-954 — expand default DSL store configuration to custom types

Accepted Kafka 3.7 Streams

Extends the default.dsl.store StreamsConfig to cover custom state store types and stream-stream joins (both windowed and the internal KeyValueStore used for certain join types), which were previously hardcoded to RocksDB or in-memory stores. Without this, there was no way to use a fully custom store implementation across all DSL operators, especially the additional KeyValueStore in certain stream-stream join topologies.

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