PRW2: support type and unit labels #7059
Description
Is your feature request related to a problem? Please describe.
Add type and info labels in PRW2 handler
Describe the solution you'd like
In Prometheus prwv2 implementation, there is a feature flag of enableTypeAndUnitLabels to control unit and labels ingestion. https://github.com/prometheus/prometheus/blob/main/storage/remote/write_handler.go#L425
We may want to make it a per tenant runtime config.
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A clear and concise description of any alternative solutions or features you've considered.
Additional context
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