Notification and webhooks of git notes push events
### Problem to solve
It would be great to receive email notification or use a webhook to trigger and event when a new git notes has been pushed. Currently the push events are only sent for commits push.
### Intended users
Developers and DevOps.
### Further details
We are saving metadata in the git notes (for example versions of software modules that will be used for publishing/deployment purposes) and we would like to know when those version change.
### Proposal
Just add another webhook trigger checkbox with "Notes push events" and send notifications also when notes push happens.
### Permissions and Security
Same as normal push events.
issue