Move functions from protractor to math/

[benchristel]

These math functions weren't tested, and had some lurking bugs which I've
now fixed.

Issue: LEMS-2135

Test plan:

yarn test

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/new-eyes-repeat.md, packages/perseus/src/widgets/interactive-graphs/protractor.tsx, packages/perseus/src/widgets/interactive-graphs/graphs/utils.ts, packages/perseus/src/widgets/interactive-graphs/locked-figures/locked-line.tsx, packages/perseus/src/widgets/interactive-graphs/math/angles.test.ts, packages/perseus/src/widgets/interactive-graphs/math/angles.ts, packages/perseus/src/widgets/interactive-graphs/math/index.ts, packages/perseus/src/widgets/interactive-graphs/math/interpolation.test.ts, packages/perseus/src/widgets/interactive-graphs/math/interpolation.ts, packages/perseus/src/widgets/interactive-graphs/graphs/components/vector.tsx

---

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[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (f1c75e9) and published it to npm. You
can install it using the tag PR1394.

Example:

yarn add @khanacademy/perseus@PR1394

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR1394

[github-actions]

Size Change: +100 B (+0.01%)

Total Size: 854 kB

Filename	Size	Change
packages/perseus/dist/es/index.js	415 kB	+100 B (+0.02%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.2 kB
packages/kmath/dist/es/index.js	4.26 kB
packages/math-input/dist/es/index.js	80.8 kB
packages/math-input/dist/es/strings.js	1.73 kB
packages/perseus-core/dist/es/index.js	906 B
packages/perseus-editor/dist/es/index.js	272 kB
packages/perseus-error/dist/es/index.js	866 B
packages/perseus-linter/dist/es/index.js	21.8 kB
packages/perseus/dist/es/strings.js	3.21 kB
packages/pure-markdown/dist/es/index.js	3.67 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70.98%. Comparing base (caf7148) to head (f1c75e9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1394      +/-   ##
==========================================
+ Coverage   69.77%   70.98%   +1.20%     
==========================================
  Files         502      507       +5     
  Lines      105123   105221      +98     
  Branches     5323    11333    +6010     
==========================================
+ Hits        73351    74692    +1341     
+ Misses      31656    30529    -1127     
+ Partials      116        0     -116     

Files	Coverage Δ
...ts/interactive-graphs/graphs/components/vector.tsx	100.00% <100.00%> (ø)
...eus/src/widgets/interactive-graphs/graphs/utils.ts	96.29% <ø> (-3.71%)	⬇️
.../interactive-graphs/locked-figures/locked-line.tsx	99.28% <100.00%> (-0.02%)	⬇️
...rseus/src/widgets/interactive-graphs/math/index.ts	100.00% <100.00%> (ø)
...c/widgets/interactive-graphs/math/interpolation.ts	100.00% <100.00%> (ø)
...seus/src/widgets/interactive-graphs/protractor.tsx	31.46% <87.50%> (+0.81%)	⬆️
...seus/src/widgets/interactive-graphs/math/angles.ts	89.18% <81.81%> (-3.12%)	⬇️

... and 117 files with indirect coverage changes

---

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[jeremywiebe]

LGTM. 👍