Khan / perseus / 5478114505

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[Analytics] 1. Introduce DependenciesContext (#600)

## Summary:

This PR introduces a new React Context for plumbing dependencies through Perseus. The context uses a new type `PerseusDependenciesV2` (so it doesn't conflict with the original `PerseusDependencies`). 

This PR also provides a React hook (`useDependencies`) for accessing dependencies. This hook will commonly be used in wrapper component to attach dependencies to the wrapped component (next PR). 

I also renamed `sendEvent` to `onAnalyticsEvent` as that feels more natural for a callback (especially event callback... a la 'onClick`). This causes a bit more churn but hopefully that's ok as we're early in the analytics journey.

Issue: LC-950

## Test plan:

`yarn test`
`yarn tsc`

Author: jeremywiebe

Reviewers: nedredmond, eamspoker, jeremywiebe, handeyeco

Required Reviewers:

Approved By: nedredmond

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

Pull Request URL: https://github.com/Khan/perseus/pull/600

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