Add a pumpkin pet

[emieczko]

Addresses #791

This adds a pumpkin pet, complete with idle, swipe, "walk", and "run" animations (note that the pumpkin does not move).

Full credit goes to Barking Doggos for the pumpkin and Elska for the small bat. I just combined the two assets and made some small adjustments.
https://barking-doggos.itch.io/free-animated-pixel-art-halloween-pumpkin
https://elska.itch.io/free-bat

(second time trying this since i deleted by first pr because I'm an idiot)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.75%. Comparing base (c59fb82) to head (2363286).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/panel/pets/pumpkin.ts	44.44%	5 Missing ⚠️
src/panel/pets.ts	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #800      +/-   ##
==========================================
+ Coverage   17.72%   17.75%   +0.02%     
==========================================
  Files          36       37       +1     
  Lines        1879     1904      +25     
  Branches      232      235       +3     
==========================================
+ Hits          333      338       +5     
- Misses       1540     1560      +20     
  Partials        6        6              

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[tonybaloney]

I think the animation where the bat flies out of the eye should be the swipe animation.

The run state seems too much, the bat keeps flying out on a loop. Remove that one (see suggested changes).