Geocoder API Url endpoints for performing Geocode and Reverse Geocode operations (8.x-2.x)

With the attached patch,
the Geocoder module may provide the following API Url endpoints (with Json output), to be consumed for performing direct Geocode and Reverse Geocode operations respectively, allowing also easy and custom implementation of Geocode Autocomplete inputs to third party (dependent) modules.

Geocode

This endpoint allows to process a Geocode operation (get Geo Coordinates from Addresses) on the basis of an input Address, the operational Geocoders and an (optional) output Format (Dumper).

Path: '/geocoder/api/geocode'
Method: GET
Access Permission: 'access geocoder api endpoints'
Successful Response Body Format: json

Reverse Geocode

This endpoint allows to process a Reverse Geocode operation (get an Address from Geo Coordinates) on the basis of an input string of atitude and Longitude coordinates, the operational Geocoders and an (optional) output Format (Dumper).

Path: '/geocoder/api/reverse_geocode'
Method: GET
Access Permission: 'access geocoder api endpoints'
Successful Response Body Format: json

NOTE:

The patch updates/integrates the Readme.md file with API Endpoints use parameters details.