feat(rome_js_parser): declare generator function in an ambient context

[denbezrukov]

Summary

Add Generators are not allowed in an ambient context. error for generator functions in an ambient context.

Typescript playground

For function overloading Rome has an error: https://github.com/rome/tools/blob/4084d3e18e5d38b006e0dc99b3ce5975f9e01bf2/crates/rome_js_parser/src/syntax/function.rs#L280-L285

Test Plan

cargo test

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