Add historical time-series support for SEMrush Overview metrics#1917

Description:
The current SEMrush connector returns domain-level Overview metrics such as Organic Keywords, Organic Traffic, Organic Cost, Organic Positions 1-3, and Organic Positions 4-10 as current snapshots without an underlying date dimension.

As a result, generic time fields such as Month and Yearmonth return null, and users cannot build historical/trended charts from these metrics.

SEMrush provides historical reporting capabilities for several Overview metrics, including a reporting date together with metrics such as Organic Keywords, Organic Traffic, and Organic Cost.

Please investigate adding historical time-series support to the SEMrush connector, ideally through a historical Overview report/preset, so users can retrieve these metrics by reporting period and build month-over-month or other trend analyses.

Also review whether Organic Positions 1-3 and Organic Positions 4-10 can be supported historically, as these fields may require a different SEMrush endpoint or additional aggregation.