fix: added missing js reference for map layers

[CatchABus]

Right now, there are a couple of cases of weak references being lost because carto map does not keep refs of layers on JS-side.

This PR ensures that we keep a proper reference of Layers instance and its layers using a JS array.
It also corrects a few types and keeps all common methods related to Layers in common file.

Additionally, method getLayers becomes lazy and instantiates Layers once during first execution, provided that native view is already initialized.
Getter mapView becomes common and is now added to types.
Certain Layers methods returned wrong type. See https://cartodb.github.io/mobile-android-samples/reference/com/carto/components/Layers.html#removeAll(com.carto.layers.LayerVector)
Methods addAll, setAll, and removeAll have been fixed as they called certain other Layers instance methods without this context.
Example of the problem:

removeAll(layers: Layer<any, any>[]) {
    layers.forEach(this.remove); // Method remove will be executed as a plain callback, missing context
}

[farfromrefug]

@CatchABus complex to read from my phone. But it looks ok to me. You tested about all.methods ?

[CatchABus]

@CatchABus complex to read from my phone. But it looks ok to me. You tested about all.methods ?

I have injected the changes in node_modules and am currently using them in our app!

[CatchABus]

@farfromrefug Is there anything I can do to help speed up merging those?
If you give me the approval, I can merge all pending.

[farfromrefug]

@CatchABus sure do