Feature target metadata (#757)

* Defined the model for target matadata and the corresponding repository layer/management
* Added target metadata quotas incl enforcement
* Extended Target Mgmt REST API to allow for metadata CRUD operations
* Added migration scripts for each database
* Added back reference to target metadata in JpaTarget
* Added tests for target management, Mgmt REST API, target metadata RSQL, and REST documentation
* Updated asciidocs for target rest documentation
* Fix Allure imports and annotations
* Fix review findings

Signed-off-by: Bogdan Bondar <Bogdan.Bondar@bosch-si.com>
Signed-off-by: Stefan Behl <stefan.behl@bosch-si.com>

hawkbit-repository/hawkbit-repository-core/src/main/java/org/eclipse/hawkbit/repository/PropertiesQuotaManagement.java

@@ -58,6 +58,11 @@ public class PropertiesQuotaManagement implements QuotaManagement {
         return securityProperties.getDos().getMaxMetaDataEntriesPerDistributionSet();
     }
 
+    @Override
+    public int getMaxMetaDataEntriesPerTarget() {
+        return securityProperties.getDos().getMaxMetaDataEntriesPerTarget();
+    }
+
     @Override
     public int getMaxSoftwareModulesPerDistributionSet() {
         return securityProperties.getDos().getMaxSoftwareModulesPerDistributionSet();