Opt into security advisory policy

I'm currently in the process of getting the module approved by the Security Advisory. If anyone who uses this module has some time and would like to review the application, it would help push this process through faster. That would be much appreciated.

https://www.drupal.org/project/projectapplications/issues/3468193 →

Hey @droath yes of course, thank you!

I'm currently reviewing the code. Also mind my (Co-)maintainer application afterwards, if you could use some help maintaining this.

@droath FYI: My offer to Co-maintain and opt-in to security advisory policy still stands.

I also reviewed #3468193: [2.1.x] Entity Extra Field → which needs your work now. :)