Khan / perseus / 5651154537 / 2 – jest

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Allow APIOptions.trackInteraction()'s arg object to have extra keys (#616)

## Summary:

In #609 I clarified the trackInteraction API types. However, I missed defining that the `APIOptions.trackInteraction` argument object can have extra, arbitrary keys provided by the widget that originates the interaction. 

This PR adds that to the `trackInteraction` function type. 

Issue: "none"

## Test plan:

`yarn tsc`
`yarn test`

Author: jeremywiebe

Reviewers: jeremywiebe, handeyeco

Required Reviewers:

Approved By: handeyeco

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

Pull Request URL: https://github.com/Khan/perseus/pull/616

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