Create a generic copy or clone api

This is a spin off of #4130 (closed)

I was looking at supporting import job templates & thought a clone or copy api makes sense.

I'm no longer prioritising this part & I think putting the code in the form layer or BAO layer for the specific entity is enouugh for now.

In order to clone the job the code looks something like

    $userJob = UserJob::get()->addWhere('id', '=', $templateID)->execute()->first();
      unset($userJob['metadata']['DataSource']['table_name'], $userJob['metadata']['submitted_values']['uploadFile'], $userJob['id'], $userJob['created_id'], $userJob['created_date'], $userJob['expires_date']);
      $userJobID = UserJob::create(FALSE)->setValues($userJob)->execute()->first()['id'];
  

I feel like there is a case for a generic Copy api - in the DAO we have a function with a signature that I think is probably 'a bit much' - so it might make sense to migrate to a new function... & create a generic API

I checked what Entities implement Copy and found a handful -the non static ones are not in the BAO - so we just have one non-std signature which is unused https://github.com/civicrm/civicrm-core/pull/25594

One option would be to add a parameter to the schema eg.

'is_not_clonable'

And then we could add that to fields like created_id and they would not need to be in the params. We already have the title of the entity so can assume that should be prefixed with Copy Of. The UserJob would have to override to set some of the deeper values