refactor(ast_codegen): declutter the main file.

[rzvxa]

same as #4741

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[rzvxa]

• fix(ast_macros): raise compile error on invalid generate_derive input. #4766
• fix(ast, ast_codegen): use generate_derive instead of visitable for generating span derives. #4747
• refactor(ast_codegen): declutter the main file. #4744 👈
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #4744 will not alter performance

_{Comparing 08-08-refactor_ast_codegen_declutter_the_main_file (abe8202) with main (7345f68)}

Summary

✅ 29 untouched benchmarks

[overlookmotel]

The diff is too large for me to easily understand what this PR is doing. I was only just starting to get my head around the codegen.

But it doesn't alter the generated output, so I'm going to merge it, and can suggest revisions later on if required.

[graphite-app]

Merge activity

• Aug 8, 12:37 PM EDT: The merge label 'merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Aug 8, 12:37 PM EDT: overlookmotel added this pull request to the Graphite merge queue.
• Aug 8, 12:43 PM EDT: overlookmotel merged this pull request with the Graphite merge queue.

[rzvxa]

@overlookmotel It doesn't change any of the logic, Just moves the codegen related stuff to its own module so the main file only contains the bootstrapping code.