Make `get_attr_value` accessible from formatter

[okapies]

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Is your feature related to a problem? Please describe.

I'm writing custom formatters:

class AddressAdmin(ModelAdmin, model=Address):
    ...
    _formatters = {
        Address.user: lambda m, a: formatters.format_user(m.user, a),
    }
    column_formatters = _formatters
    column_formatters_detail = _formatters

but accessing its attribute like m.user everytime in the format function is a bit verbose and error prone. I'd like to use get_attr_value method implemented in ModelAdmin.

Describe the solution you would like.

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Describe alternatives you considered

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Additional context

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