[BUG] Clear Basemap Array

[jolevesq]

Is there an existing issue for this?

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Current Behavior

Currently, basemap package delete the arrays of basemap on unload. We should ahev something to notify other user of basemap...

Quote from @Alex-NRCan
We should call a function on the Basemap object (e.g.: this.mapViewer().basemap.clearBasemaps() which clears the basemaps list. That way, if there are other components working on the basemaps array, we can make them aware of this clearing happening. (Or we use an event-processor/state thing,

Expected Behavior

Call afunction to notify basemaps changed

Steps To Reproduce

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Anything else?

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