Update Here Geocode and Reverse Geocode Provider to GS7 (v7)

Here.com has released their GS7 (v7) API.

We are currently using here-provider 0.6.0 that is using v6.2 endpoints. We are updating to use Here's GS7 endpoints per a conversation with our Here.com rep. Our rep let us know that Here.com intends to drop support for our current endpoints (v6.2) and that we should switch to the new GS7 endpoints.

Note: with the change to GS7 the shape of the responses from here has completely changed
Update was made using the following Here.com Documentation.

Here Migration Docs
https://www.here.com/docs/bundle/geocoding-and-search-api-migration-guide/page/migration-geocoder/README.html

Geo-code Endpoint Docs
https://www.here.com/docs/bundle/geocoding-and-search-api-developer-guide/page/topics/endpoint-geocode-brief.html

Reverse Geo-code Endpoint Docs
https://www.here.com/docs/bundle/geocoding-and-search-api-developer-guide/page/topics/endpoint-reverse-geocode-brief.html

Here API Reference
https://www.here.com/docs/bundle/geocoding-and-search-api-v7-api-reference/page/index.html

Start with the Here provider that currently uses here-provider 0.6.0 and compare its geocode and reverse-geocode handling with the linked migration, endpoint, and API reference documentation. Update the integration for GS7 endpoints and its changed response shapes; done means both operations use the new API without relying on the v6.2 response structure.