KIP-1245 — Enforce 'application.server' <server>:<port> format at config level

Accepted Kafka 4.4 Streams

Moves validation of the application.server config (must be <host>:<port> format) from KafkaStreams construction time to StreamsConfig construction time, enabling faster fail detection. The check currently happens at client construction, which is too late for frameworks that create StreamsConfig independently and want to surface configuration errors before instantiating the streams instance.

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