chore(gatsby): Convert babel-parse-to-ast to TypeScript

[john015]

Description

Convert src/utils/babel-parse-to-ast.js to TypeScript.

I could not use ParserOptions Interface exported by @babel/parser to declare the return value of the getBabelParserOptions function.

Because the ParserOptions interface and PARSER_OPTIONS declared in the babel-parse-to-ast.js file are incompatible.

So instead of ParserOptions interface, I temporarily declared the return value of the getBabelParserOptions function as object type.

Related Issues

Related to #21995

[blainekasten]

This looks great to me, let's merge it!

Thank you so much for contributing to our TypeScript refactor! We have more work to do and we would love to have you stay involved in our transition. Please submit more PRs! 💜

[gatsbot]

Holy buckets, @john015 — we just merged your PR to Gatsby! 💪💜

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[pvdz]

Published in gatsby@2.20.4