Add support for base class for enums

[rezondrey]

Is your feature request related to a problem? Please describe.

Python 3.11 has introduced some breaking changes for enums when used in f-strings.

class MyEnum(str, Enum):
    VALUE = "value"

# Prior python 3.11:    
print(f'{MyEnum.VALUE}')
    # => "value"
# Since python 3.11:
print(f'{MyEnum.VALUE}')
    # => "MyEnum.VALUE"

This behavior is different when using the new StrEnum:

 from enum import StrEnum

class MyEnum(StrEnum):
    VALUE = "value"
    
# Python 3.11:
print(f'{MyEnum.VALUE}')
    # => "value"

This blog describes the problem:
https://blog.pecar.me/python-enum

Describe the solution you'd like
Add support for additional argument, or extend "--use-subclass-enum" to allow choosing between (str, Enum) and StrEnum

Or maybe even allow selecting base class for enums, for people using custom enum packages such as https://pypi.org/project/StrEnum/

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[GeorgeFischhof]

Hi,
I installed version 0.25.8 and found the same: datamodel-code-generator creates classes from (str, Enum) instead of StrEnum

BR,
George