Add metro (DMA) as a supported geographic dimension in the GA4 connector#1962

For client ceo@bsmtk.com

The googleanalytics4 connector currently exposes country, region, and city as geographic dimensions, but not metro (DMA-level). Requesting metro be added to the supported field list.

Current error:
Unexpected field(s): {‘metro’}

these fields are not available on the ga4 api so they cannot be added