- [x] Create generic `send_doc_confirmation()` - [x] Use it in send-document commands - [x] `certify` - [x] `membership` - [x] `transfer` v2 - [ ] other cmds - [ ] Adapt tx tests - [ ] Create `patched_send_doc_confirmation()` #379: Would allow to run `test_membership_cmd()` without sending the document by running `patched_send_doc_confirmation.assert_awaited_once_with()`