KIP-536 — Propagate broker start time to Admin API

Discussion AdminProtocol

Adds a `startTimeMs` field to the `DescribeCluster` Admin API response (and the `Node` class) carrying each broker's start time in milliseconds. The only existing way to retrieve broker start times was to query ZooKeeper directly (`/brokers/ids/<id>`), which is a privileged operation and will be unavailable post-KIP-500.

Protocol Impact

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