fastdom dependency was not used

[kristw]

Superset version

Current

Expected results

nvd3 took advantage of fastdom as intended by this PR
#3947

Actual results

fastdom has never been imported into the js code, so window.fastdom does not exist and nvd3 in superset did not get the benefits.

From nvd3 https://github.com/novus/nvd3/blob/master/src/dom.js

nv.dom.write = function(callback) {
	if (window.fastdom !== undefined) {
		return fastdom.mutate(callback);
	}
	return callback();
};

To-do

Either remove fastdom from dependency or add import 'fastdom';

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