Khan / perseus / 5981240534

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Propogate 'static' functions for Expression on exported forwardRef component (#694)

## Summary:

In #601 I worked out providing our new V2 PerseusDependencies to the Expression component by wrapping it in a `forwardRef<>` functional component and using a hook to get access to the dependencies. 

This worked, until we discovered that there is code in some consuming applications that calls static functions on our Widget components. 

This PR patches the exported functional component to provide the same 3 static functions. In the future, we will want a more robust solution, possibly moving this functionality into our renderers so that consuming applications don't deal with widgets directly.

Issue: LC-1180

## Test plan:

`yarn test`

Wait for this PR to push a snapshot npm package and then integrate with Webapp and test.

Author: jeremywiebe

Reviewers: handeyeco

Required Reviewers:

Approved By: handeyeco

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

Pull Request URL: https://github.com/Khan/perseus/pull/694

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