Validate a property name for a
GParamSpec. This can be useful for
dynamically-generated properties which need to be validated at run-time
before actually trying to create them.
See [canonical parameter names][canonical-parameter-names] for details of the rules for valid names.
The canonical name of the property.
|The data is owned by the caller of the function.|
|The string is a NUL terminated UTF-8 string.|