[PropertyInfo] Deprecate Type

[MrYamous]

Fixes #20799

[OskarStark]

friendly ping @mtarld

[mtarld]

All of these methods are kind of removed:

• getBuiltinType is the same as getTypeIdentifier of BuiltinType and ObjectType
• isNullable still exists
• getClassName only exists on ObjectType
• isCollection is the equivalent of $type instanceof CollectionType
• getCollection[Key|Value]Types is the same as getCollection[Key|Value]Type of CollectionType

The Type of TypeInfo is really different from the one from PropertyInfo, so I think we might rewrite that part completely.

Or maybe redirect to the doc related to TypeInfo's Type?

[MrYamous]

Thanks, I missed those differences.
Maybe we can remove this part from PropertyInfo Type doc as the class is deprecated and update TypeInfo doc with appropriate methods ?

[OskarStark]

I would also not mix the TypeInfo things into the doc of PropertyInfo