Add expression support

[nitaliano]

With both the iOS and Android SDKs adding support for expressions it's time to move the React Native SDK over to add support for them as well

[1ec5]

iOS map SDK v4.0.0 and above has +[NSExpression(MGLAdditions) expressionWithMGLExpressionObject:] and NSExpression.mgl_jsonExpressionObject methods for round-tripping between NSExpression and NSArrays that are consistent with the style specification. Once mapbox/mapbox-gl-native#11751 is fixed, there will also be +[NSPredicate(MGLAdditions) predicateWithMGLJSONObject:] and NSPredicate.mgl_jsonExpressionObject methods for round-tripping between NSPredicate and NSArray, which will be necessary for filtering MGLVectorStyleLayer.

Beyond that, you’ll need to account for the renamed symbols in mapbox/mapbox-gl-native#11568.