Add section after imports and before dependencies

[ialarmedalien]

Describe

When generating classes with a custom template, I need to add some extra initialisation matter after the imports and before the list of classes, e.g.

from pydantic import Field
import pydantic
from typing import Any, Dict, List, Literal, Optional, Union
import dataclasses
[ ... ]

# some additional initialisations here
dataclasses._init_fn = dataclasses_init_fn_with_kwargs

class WeakRefBaseModel(pydantic.BaseModel):
    __slots__ = '__weakref__'

# class list starts here

Do you have any objections to the module being extended in this manner?