[BIFROST-8154] Node to query attribute type

[frenchdog]

From the discussion starting here on usd-interest It would be handy to get the type of an attribute. For example, in Sachin's scenario, he needs to know if an attribute "foo" is of type "Token" in order to convert it to a "String". A nodedef named get_attribute_type_name would take an attribute input and would return a string.