KIP-453 — Add close() method to RocksDBConfigSetter

Accepted Kafka 2.3 Streams

Adds a close() method to the RocksDBConfigSetter interface, called when the RocksDB instance is shut down, allowing users to release native RocksObjects they created in setConfig(). RocksJava options objects (e.g., BlockBasedTableConfig, BloomFilter) extend AbstractNativeReference and must be explicitly closed to free C++ heap memory; without a close hook, user-created objects leaked native memory.

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