Sub-attribute parsing was introduced with CCSDK-1061. It enables get_attribute to target a specific value from resource resolution.

It assumes that the targeted content is JSON, however in the case of resource resolution it is a string. The actual format inside the string is dictated by the template, which could be anything (xml, yaml, json...)

In order for sub-attribute parsing to work, we need to add a new attribute to Resource resolution component, which always holds the resolved values in JSON format.