Convert autop package to TypeScript

[jpstevens]

What?

This PR converts the autop package to TypeScript.

Why?

Ensures package is fully type checked.

How?

• converted files to .ts
• added explicit return types for functions .ts files
• explicitly typed variables that would otherwise be implicit any

Testing Instructions

npm run test:unit -- packages/autop tests pass npm run build:package-types returns a zero exit code

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Co-authored-by: jpstevens <[email protected]>
Co-authored-by: jsnajdr <[email protected]>
Co-authored-by: sirreal <[email protected]>

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[sirreal]

👋 @jpstevens Thanks for this! If you'll update this PR on the latest trunk and address feedback we can likely give this a final review and land it.