Low level GeoJson implementation

Nadie ha tomado este issue todavía.

This is a request for either a rewrite or alternative implementation of the current GeoJson module found [here](https://github.com/mapbox/mapbox-java/blob/master/services-geojson). We need a high performance implementation that has a minimal memory footprint. The reasoning behind that is that geojson models should be scalable (eg. downstream we query the map for 1000 of features, the path currently taken to create those and the intermediate objects created for doing that isn't optimal atm).

Couple of thoughts to improve this:
- use primitive instead of objects where possible
- no need for AutoValue, implementation is based on a specification that doesn't change (often)
- if geojson models are immutable, use arrays instead of List
- limit method invocations & don't allocate memory if you can avoid it
- don't over abstract concepts if they can be expressed more simple

More information on performance tips [here](https://developer.android.com/training/articles/perf-tips.html)
RFC of GeoJSON can be found [here](https://tools.ietf.org/html/rfc7946).

cc @mapbox/android

Comienza revisando la implementación actual en services-geojson y, a continuación, compara su estructura de modelos con RFC 7946 y los consejos de rendimiento de Android enlazados. Define cómo medirá la reescritura o alternativa la huella de memoria y el rendimiento para aproximadamente 1.000 features; se considerará terminado cuando los modelos GeoJSON cumplan los objetivos de escalabilidad solicitados sin asignaciones ni abstracciones innecesarias.

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