[core] Add MapOptions to define properties of Map

To simplify the Map constructor, introduce MapOptions
interface to define the properties that can be set on
a Map.

test/api/custom_geometry_source.test.cpp

@@ -1,6 +1,7 @@
 #include <mbgl/test/util.hpp>
 
 #include <mbgl/map/map.hpp>
+#include <mbgl/map/map_options.hpp>
 #include <mbgl/util/shared_thread_pool.hpp>
 #include <mbgl/storage/default_file_source.hpp>
 #include <mbgl/gl/headless_frontend.hpp>
@@ -24,7 +25,7 @@ TEST(CustomGeometrySource, Grid) {
     float pixelRatio { 1 };
     HeadlessFrontend frontend { pixelRatio, fileSource, *threadPool };
     Map map(frontend, MapObserver::nullObserver(), frontend.getSize(), pixelRatio, fileSource,
-            *threadPool, MapMode::Static);
+            *threadPool, MapOptions().withMapMode(MapMode::Static));
     map.getStyle().loadJSON(util::read_file("test/fixtures/api/water.json"));
     map.jumpTo(CameraOptions().withCenter(LatLng { 37.8, -122.5 }).withZoom(10.0));