chore: Migrates from `typings-tester` to `dtslint`

[jmyrland]

typings-tester is really, really slow. Averaging in well over 2 minutes per run.

dtslint provides a few benefits; it runs the typescript tests against multiple typescript versions, in addition to being a lot faster (~8 seconds for the actual test and ~14 seconds for installing TS version, which is cached)

• Removes typings-tester dependency
• Adds a new dtslint script, which does "expect" testing for all tests/typescript files
• Updates the tsconfig to be dtslint-compatible
• Fixes broken tests (missing react imports when using jsx, etc)
• Updates github workflow to run dtslint
• Updates existing scripts (cleanup test-scripts)

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
easy-peasy	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 25, 2023 5:44am

[no-stack-dub-sack]

Sweet! Nice quality of life update here. Good stuff @jmyrland!