ref(core): Type metric units with MetricUnit - #23304
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Types the
unitfield on the metrics API (MetricOptions,Metric,SerializedMetric) instead of leaving it as a barestring.It reuses the existing
LiteralUnionhelper so the canonical units that match the develop docs get autocomplete while arbitrary strings still pass through, which the spec requires ("SDKs MUST NOT restrict unit values").I deliberately did not reuse
MeasurementUnithere: it carries aNoneUnit('' | 'none') that is a leftover from the old transaction-measurement system and is not a valid metric unit.