BooleanGroup support

[inventionate]

Thank you very much for the great package. At the moment I'm trying to use it with the BooleanGroup field, so that when a value is selected there, another field is displayed. Unfortunately, the BooleanGroup field requires an array cast for the source model attribute, so the current ->if() function cannot be used. I actually wanted to use `->if('booleangroup_field contains "MyValue":true') or something like that. Is there a way or an idea how I could implement this?

[inventionate]

It's probably more like a hotfix, but when I change line 226 in ConditionalContainer.php to return Str::contains(json_encode($attributeValue), $conditionValue); BooleanGroup conditions work. I think a special is_array() check isn't needed and the json_encode() addition shouldn't break anything else. Whereas I'm pretty sure there are better solutions.