Khan / perseus / 5743663332

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Rework args to trackInteraction so it works when we generate Flow types for it (#625)

## Summary:

I've been working to get a proper type for the `trackInteraction` `APIOption`. I've migrated the `InteractionTracker` to be generic so that it only accepts extra arguments defined by the `WidgetProps<T,T,T>` (this means each widget can call `trackInteraction` with args it defines). 

In the `APIOptions` the `trackInteraction` callback now defines a union of all extra args that all widgets provide.

Issue: "none"

## Test plan:

Build, build flow types, and then test it in webapp.

Author: jeremywiebe

Reviewers: jeremywiebe, nedredmond, handeyeco, kevinbarabash, SonicScrewdriver

Required Reviewers:

Approved By: handeyeco

Checks: ✅ finish_coverage, ✅ Publish npm snapshot (ubuntu-latest, 16.x), ✅ Check builds for changes in size (ubuntu-latest, 16.x), ✅ Extract i18n strings (ubuntu-latest, 16.x), ✅ Cypress Coverage (ubuntu-latest, 16.x), ✅ Lint, Typecheck, and Test (ubuntu-latest, 16.x), ✅ Jest Coverage (ubuntu-latest, 16.x), ✅ Check for .changeset file (ubuntu-latest, 16.x), ✅ gerald

Pull Request URL: https://github.com/Khan/perseus/pull/625

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