Reads the specified list of attributes of a file in bulk.
The list of attributes to read is specified in the following string form:
So the names are comma-separated and optionally prefixed by the attribute view type name,
basic by default.
* attribute name can be used to read all attributes of the specified view.
Return a Map<String, Any?> having an entry for an each attribute read, where the key is the attribute name and the value is the attribute value.