mypy

39e96f50 - [mypyc] Refactor: extract class-related genops to a new module (#8407)

[mypyc] Refactor: extract class-related genops to a new module (#8407) Also extract some utilities. This mostly preserves the original structure of the code, even though it's not optimal after extraction. This is something I plan to clean up later. This introduces an import cycle that I will fix in a later PR.