Function and Record properties should fail no-incompatible-property-type

[steverep]

Properties which have a function type should fail the no-incompatible-property-type rule unless a custom converter is provided. For example, this should fail as String certainly will not result in a valid conversion:

@property() public funcProp?: () => void;

For function properties, only including a custom converter or {attribute: false} should pass the rule.

[steverep]

I also noticed that Record<...> types also pass with the default String converter, and they certainly should not.