style: Organize imports via Prettier

[samestep]

This PR adds https://github.com/simonhaenisch/prettier-plugin-organize-imports to the repo:

This is the same as using the "Organize Imports" action in VS Code.

CI on the first commit to this PR shows that disorganized imports now get caught automatically: https://github.com/penrose/penrose/runs/5113952369?check_suite_focus=true

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[wodeni]

Awesome!

[codecov]

Codecov Report

Merging #883 (b5e3b03) into main (c1626cf) will not change coverage.
The diff coverage is 100.00%.

❗ Current head b5e3b03 differs from pull request most recent head 5f27301. Consider uploading reports for the commit 5f27301 to get more accurate results

@@           Coverage Diff           @@
##             main     #883   +/-   ##
=======================================
  Coverage   67.51%   67.51%           
=======================================
  Files          62       62           
  Lines        8206     8206           
  Branches     1774     1774           
=======================================
  Hits         5540     5540           
  Misses       2659     2659           
  Partials        7        7           

Impacted Files	Coverage Δ
packages/core/src/analysis/SubstanceAnalysis.ts	49.68% <ø> (ø)
packages/core/src/compiler/Substance.ts	90.93% <ø> (ø)
packages/core/src/contrib/Minkowski.ts	100.00% <ø> (ø)
packages/core/src/engine/BBox.ts	84.61% <ø> (ø)
packages/core/src/engine/Evaluator.ts	61.67% <ø> (ø)
packages/core/src/engine/PropagateUpdate.ts	31.81% <ø> (ø)
packages/core/src/parser/ParserUtil.ts	97.01% <ø> (ø)
packages/core/src/renderer/Circle.ts	100.00% <ø> (ø)
packages/core/src/renderer/Ellipse.ts	27.27% <ø> (ø)
packages/core/src/renderer/Image.ts	84.37% <ø> (ø)
... and 34 more

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