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

从当前使用 here-provider 0.6.0 的 Here provider 开始，将其 geocode 和 reverse-geocode 处理与链接的迁移、endpoint 和 API 参考文档进行比较。更新集成以适配 GS7 endpoint 及其变更后的响应结构；当两个操作都使用新 API，且不依赖 v6.2 的响应结构时，即表示完成。