KIP-1234 — Move and Add Arguments to version-mapping Commands

Discussion KRaftAdmin

Moves --bootstrap-server/--bootstrap-controller from a globally required argument group in kafka-feature.sh to per-subcommand required args, and adds a --unstable-feature-versions flag to the version-mapping subcommand. Offline subcommands like version-mapping were blocked from running without unnecessary cluster connection arguments, and unstable metadata versions were not queryable from the CLI.

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