Add Nominatim query functionality

[rolyhudson]

Description:

Nominatim (from the Latin, 'by name') is a tool to search OSM data by name and address (geocoding) and to generate synthetic addresses of OSM points (reverse geocoding). It can be found at nominatim.openstreetmap.org.

Would be good to access queries to the nominatim api from OpenStreetMap_Toolkit
This will provide a way of working with OpenStreetMap queries without knowledge of defining search location by latitude and longitude.

API documentation is here https://nominatim.org/release-docs/develop/api/Overview/

Initial functionality should include:

• Input of the search string
• Run the query via HTTP adapter

As multiple results are likely these should include:

• a way to easily check (maybe a url to the map showing the area or object found)
• a BH.oM.Adapters.OpenStreetMap.IOpenStreetMapRegion to use for onward search
• a BH.oM.Adapters.OpenStreetMap.Node at the centroid of the region to use for onward search

@rwemay other thoughts for initial functionality?

[rolyhudson]

@tg359 I understand you may have an interest in this or have already developed something related?