Render and algorithm settings for MarkerClustererOptions

[TheAtomicOption]

This makes it possible to set a custom render or algorithm function via MarkerClustererOptions without needing to host a custom version of objectManager.js to set the option when instantiating the js-markerclusterer object.

Example of usage is added to objectManager.js and MapMarker.razor.cs in ServerSideDemo, but commented out as most people will probably want the defaults.

[TheAtomicOption]

added commit to fix typo for algorithm object pathing

[TheAtomicOption]

After looking at this some more, both are implemented as classes by js-markerclusterer which helps when they have settings of their own. To handle that we'd likely pass a JsObjectRef as the parameter value instead. I think in that case though I'd want to use different property names to match anyway, so this isn't necessarily creating a future breaking change.

Does the method in this pull request seem like a worthwhile stopgap until I figure that out or should we not bother creating something we know will likely become obsolete?

[valentasm1]

I didnt understand last comment. I need more details with examples. In other hand just do as you think is right and mostly will pass my test :). I allow almost everything into this lib.
Maybe you meant smth like in Polyline CreatePath() method?

[valentasm1]

I moved that commented code for example from objectManager.js to serverSide demo js.

[valentasm1]

https://www.nuget.org/packages/BlazorGoogleMaps/2.1.0