Prevent possible conflict between `multiline-expression-wrapping` and `function-signature` body wrapping

[paul-dingemans]

In case the multiline-expression-wrapping and function-signature rules are enabled, and setting function_signature_body_expression_wrapping is set to default, it may result in conflicts between the rule regarding whether a multiline body expression is to be wrapped or not.

Options:

• Document that those rules affect each other and give recommendation
• Automatically disable the multiline-expression-wrapping in case function-signature rule is enabled, and setting function_signature_body_expression_wrapping is set to default
• Extract function body expression wrapping from function-signature rule and let this be handled by multiline-expression-wrapping only