Use JSDoc comments in `build.mjs` and related scripts to provide type hints and better intellisense. I was having a hard time knowing what fields are available in different methods, and I found this quite helpful. I'm sure other newcomers to this part of our codegen infrastructure will find it helpful as well.
Codegen `ChildScopeCollector`, so that if more types have scopes added, we don't forget to add them (like the problem #5118 fixed).
The methods are in different order in the generated version, but otherwise identical to before this PR.
`visit_finally_clause` has to be added manually, as `oxc_traverse` codegen does not read or understand `#[visit(as)]` attrs.
