[Bug]: CS conversion does not support inheritance

[chaen]

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Bug Description

When converting the CS, we apply type hints conversion (split by , if defined as list[str] for example).

However, when converting a class that has been inherited in an extension, we lose the information about the vanilla diracx class.

We see the problem in LHCb now that we have extended the UserConfig

Steps to Reproduce

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Expected Behavior

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Actual Behavior

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Environment

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Relevant Log Output

pydantic_core._pydantic_core.ValidationError: 624 validation errors for Config
Registry.lhcb.Users.6f672ba5-fb03-4495-aea2-6affde572b1d.Suspended
  Input should be a valid list [type=list_type, input_value='lhcb', input_type=str]

Additional Context

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