KIP-972 — Add the metric of the current running version of kafka

Discussion MetricsBroker

Adds version and commitId as tags on the existing kafka.server:type=app-info metric's start-time-ms gauge, so Prometheus and similar numeric-metric systems can extract the running broker version via label queries. The existing app-info metric exposed version as a string attribute, which Prometheus cannot scrape as a numeric time series.

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