Add support for station last seen location

Tommy Zarickrequested to merge
tommyzarick/rustfk:165-add-station-last-seen-location into main

This is to support this App PR (fieldkit/app!142). Adds a lat and lng field in the station table and some support for updating this.

@katekuehl @jlewallen for visibility 👁️

Edited by Tommy Zarick

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