KIP-350 — Allow kafka-topics.sh to take brokerid as parameter to show partitions associated with it

Discussion Admin

Adds a `--broker-id` filter to `kafka-topics.sh --describe` to list only partitions assigned to (as leader or replica) a specific broker. Currently, operators must pipe `--describe` output through `grep` to find partitions on a given broker, which is fragile and slow in large clusters.

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