Extend add sentry stats command for invalid/valid registration

Please extent sentry command and add possibility to query two more events:
Successful qr scan:
`User registered with public_key: 7feafcce2............` 
Unsuccessful qr scan:
`malformed encryption or decryption payload`

It would be good if catalyst toolbox could printout small stats regarding above:

```
Sucessful scans: 100
Maformed QR: 1
```