KIP-1221 — Add application-id tag to Kafka Streams state metric

Accepted Kafka 4.2 StreamsMetrics

Adds an application-id tag to the Kafka Streams client-state JMX metric so that multiple instances of the same logical Streams application can be grouped together in monitoring systems. The existing metric distinguished physical instances via a UUID processId but had no application-level grouping, making it impossible to correlate separate physical instances into a single logical application in dashboards.

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