refactor(visit): Pre-generate visitor code

[kdy1]

Description:

This would improve compile time by a margin, and this is a refactoring that should be done before applying swc_allocator::boxed::Box to ES AST.

TODOs

• Use AstPath.with_guard in fold_children_with.
• Implement FoldWith for Option<T>, Box<T>, and Vec<T> if required.
• Remove swc_visit_macros.
• Implement Fold for either::Either and several more types.
• Remove dependencies of swc_ecma_visit.

Related issue:

• Closes Publish pre-codegened version of AST/visitor crates swc-project/swc#9101

[kdy1]

• refactor(visit): Pre-generate visitor code #15 👈
• main

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