* [refactor] Remove dependency to personal fork of supercluster from mapbox visualizations
- Update dependency to reference the vanilla supercluster
- Clean up backend api call for mapbox vizzes to ensure a boolean is sent to indicate whether the viz includes custom metric for clustering
- Refactor of mapbox and its cluster overlay components to use vanilla supercluster and its recommeded way for handling clustering based on custom aggregations.
- Allow reclustering within the initial bounds on render in mapbox visualizations (stay true to old behaviors).
- Remove the median aggregation from available cluster label aggregators as there is no memory efficient way to implement this and it is unknown how often this feature is used
- Updating doc to mention the backward incompatible change re median
* Perform the check for has_custom_metric through `not None` to produce a boolean and rename the field reflect it is a boolean.
* Pan mapbox map on query
- Modify the backend to send back the bounds of the points to cluster
- Clean up of mapbox component to derive lat, lon and zoom from the mercator that fitsbounds based on the bounds passed from the backend. This and the computation of clusters are now only done on initial load b/c we are not making queries to the backend on pan/zoom
- A minor clean up of unused props and also making the visual properties panel open by default
* Remove default latitude, longitude and zoom props which are unnecessary for computing the viewport now that it is driven by the bounds from the backend.
* a few small tweaks (rename vars to be sneak case and avoid two extra hash lookups)
* Break MapBox into smaller pieces
* Replace React.createElement with regular jsx
* detach setControlValue
* enable render trigger
* Pass explicit props rather than pass all that exists in payload.data. Also use formData when possible.
* Rename sliceWidth, sliceHeight to width, height. Use deconstructor. Extract function.
* use arrow function
* fix linting and remove css
