delete this file, fieldsAnalysis is an old api.

[todo]

Rath/packages/visual-insights/src/fieldAnalysis.ts

Lines 2 to 6 in 24f2609

	* todo: delete this file, fieldsAnalysis is an old api.
	*/
	import { DataSource, Field, FieldImpurity } from './commonTypes'
	import {

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This issue was generated by todo based on a todo comment in 24f2609 when #17 was merged. cc @Kanaries.

[ObservedObserver]

fixed in https://github.com/Kanaries/visual-insights/pull/13