KIP-1363 — Add --checkpoint option to kafka-metadata-shell and deprecate --snapshot

Discussion KRaftAdmin

Adds a `--checkpoint` option to `kafka-metadata-shell.sh` and deprecates `--snapshot`/`-s` as backward-compatible aliases that emit a warning. The metadata checkpoint files the tool reads use the `.checkpoint` suffix while `.snapshot` files in the log directory are producer snapshots, so the old flag name leads users to pass the wrong file.

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