KIP-475 — New Metrics to Measure Number of Tasks on a Connector

Accepted Kafka 2.4 ConnectMetrics

Adds connector-level task count metrics to Kafka Connect—`connector-total-task-count`, `connector-running-task-count`, `connector-paused-task-count`, `connector-failed-task-count`, `connector-unassigned-task-count`—per connector instance. The existing task count metric is only available at the worker level, preventing per-connector task monitoring and making it impossible to detect connectors that are creating too many or too few tasks.

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