feat(ast_tools): generate TS type defs as text file

[overlookmotel]

Incomplete. Not for merging.

This is some code that I pulled out of #6404 as it was dead code.

@ottomated opening this PR just so your WIP on this is not lost. I assume you'll want to build on it.

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[overlookmotel]

• feat(ast_tools): output typescript to a separate package #6755
• feat(ast_tools): generate TS type defs as text file #6687 👈
• feat(ast_tools): ability to generate text files #6686
• refactor(ast_tools): give GeneratorOutput and SideEffect named fields #6685
• fix(wasm): remove type defs for ArrayExpressionElement and Elision #6683
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #6687 will not alter performance

_{Comparing 10-19-feat_ast_tools_generate_ts_type_defs_as_text_file (3bac712) with main (b66ae2e)}

Summary

✅ 30 untouched benchmarks

[overlookmotel]

These changes are now part of #6755.