CIDEVSTC-99 - M112 - support search radius in meters

If buffer value endswith('m'), the client has specified buffer in meters, WKT should be converted to its geographic representation (meters) and the buffer applied.

NOTE: the ST_ compare operators (contains, within, etc) require two geometry objects, so had to cast the buffered geography object back to geometry

@mmeisinger please review for merge

will push coi-services tests after merge and bump