feat: actions v2 execution targets command side (#7384)

Adds the API to create, update, delete targets for execution in a new ExecutionService (v3alpha)

internal/static/i18n/en.yaml

@@ -535,6 +535,11 @@ Errors:
     NotExisting: Feature does not exist
     TypeNotSupported: Feature type is not supported
     InvalidValue: Invalid value for this feature
+  Target:
+    Invalid: Target is invalid
+    NoTimeout: Target has no timeout
+    InvalidURL: Target has an invalid URL
+    NotFound: Target not found
 
 AggregateTypes:
   action: Action
@@ -546,8 +551,13 @@ AggregateTypes:
   usergrant: User grant
   quota: Quota
   feature: Feature
+  target: Target
 
 EventTypes:
+  target:
+    added: Target created
+    changed: Target changed
+    removed: Target deleted
   user:
     added: User added
     selfregistered: User registered himself