* resource create and schema/model
* consider empty value in resource creation
* Address issue in mapfields that came up in testing
* Unit testing the mapFields func
* extend update
* extend read
* extend datasource.go
* update example
* extended acceptance tests and generated docs
* update description and comments
* improve messages and var names, fix update acceptance test
* extend acceptance tests, improve error messages
* Add internal ID structure to DSA instance descriptions
* Add internal ID structure to DSA credential descriptions
* Add internal ID structure to Argus descriptions
* Add internal ID structure to DNS descriptions
* Add internal ID structure to PostgresFlex descriptions
* Add internal ID structure to ResourceManager descriptions
* Add internal ID structure to SKE descriptions
* Generate updated docs
* Add first basis for migration guide