Added Size Limit for node_modules

[EthanThatOneKid]

I used this NPM package, ai/size-limit, to help with calculating the size of our node_modules directory after a clean npm i. The size of fix/247's node_modules was clocked at 39.91 MB gzipped (according to run 4835296416), so I set the threshold to 50 MB as a starting point.

As we change our package.json, we should also contemplate and refer to the threshold in our package.json. If anything, we'd like to eventually lower the threshold as time goes on.

Resolves #247.

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[diamondburned]

I'm giving the approval for this PR, though it's not the best idea that the limiting metric is the overall modules size and not tree size or whatnot. Something is better than nothing, though.