Low level GeoJson implementation

Ninguém assumiu esta issue ainda.

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

Comece revisando a implementação atual em services-geojson e, em seguida, compare sua estrutura de modelos com a RFC 7946 e as dicas de desempenho do Android vinculadas. Defina como a reescrita ou alternativa medirá o consumo de memória e o desempenho para aproximadamente 1.000 features; considera-se concluído quando os modelos GeoJSON atenderem às metas de escalabilidade solicitadas sem alocações ou abstrações desnecessárias.

Escrita pelo modelo de indexação a partir do texto da issue.