CiviCase UI: Created Date and modified date for activities and cases

Acceptance Criteria:
1. We need two columns for case: Created date & Last updated date
2. We need one columns for activity: Last updated date
3. Activity Last updated date stores the date when the data record of the activity revision is produced
4. Case Created date stores the date when the data record of the case is produced
5. Case Last updated date stores the date when any data change is made to case or case related entities (activity, people & files etc.). It gets updated whenever the changes happen.
6. These fields need to appear in the UI when viewing, not editable.