[FLINK-40295][docs] Document UDF metrics (fork reference) - #11
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Add a UDF Metrics section to the metrics documentation describing udfProcessingTime and udfExceptionCount, their operator-scoped naming (<operator>.udf.<udf_name>.<metric>), the table.exec.udf-metric-enabled and table.exec.udf-metric.sample-interval options, the effect of sampling on the overhead of the enabled path, and which function kinds are covered.
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Fork-internal PR for reviewer convenience. Not for merge here, and not yet opened upstream.
Part of the FLIP-485 stack (FLINK-38071). It will be opened against
apache:masteronce PR-3 merges.Based on
flink-38071-pr3-async, so the diff shows only this step's changes: the user-facing documentation inmetrics.md(EN + ZH).Sub-task: FLINK-40295