Make tooltip direction types enums

[jeremywiebe]

Summary:

Originally when I modernized the tooltip.tsx component, I ran into issues converting the HorizontalDirection and VerticalDirection types to enums. Kevin asked what those were so I took another run at it... and it works. 🎉

Issue: "none"

Test plan:

yarn typecheck

[changeset-bot]

🦋 Changeset detected

Latest commit: 751a630

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

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[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/many-gifts-attend.md, packages/perseus/src/components/input-with-examples.tsx, packages/perseus/src/components/tooltip.tsx, packages/perseus/src/widgets/expression.tsx, packages/perseus/src/components/__stories__/tooltip.stories.tsx

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[github-actions]

Size Change: +131 B (0%)

Total Size: 790 kB

Filename	Size	Change
packages/perseus/dist/es/index.js	397 kB	+131 B (0%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38 kB
packages/kmath/dist/es/index.js	4.13 kB
packages/math-input/dist/es/index.js	58.9 kB
packages/perseus-editor/dist/es/index.js	254 kB
packages/perseus-error/dist/es/index.js	705 B
packages/perseus-linter/dist/es/index.js	21.2 kB
packages/pure-markdown/dist/es/index.js	3.65 kB
packages/simple-markdown/dist/es/index.js	12.6 kB

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[coveralls]

Coverage: 43.594% (+0.005%) from 43.589% when pulling 751a630 on tooltip-direction-enums into 5432857 on main.

[kevinbarabash]

LGTM. Thanks for creating enums for these. 🎉