Chore: TypeScript in tests

[katspaugh]

Resolves #46 and #8

How?

• I've converted the unit tests to TypeScript
• Added a test that simply imports a few random types from the package index

Extra

• I've also unified the endpoints to not have a trailing slash

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[iamacook]

Looking good!