RESTWS-836: Add REST resource for Triggered State Conversions management (#493)
* RESTWS-836: Add REST resource for Triggered State Conversions management
* RESTWS-836: Rename endpoint to /conceptstateconversion
* RESTWS-836: Add more assertions to ConceptStateConversionResource2_0Test
* RESTWS-836: Assert workflow exists before purging
* RESTWS-836: Assert that count is +1 after create state conversion
* RESTWS-836: Add display property to ConceptStateConversion
* RESTWS-836: Assert reduction of count after purging