[Feature] audit signatures

[kabo]

• I'd be willing to implement this feature (contributing guide)
• This feature is important to have in this repository; a contrib plugin wouldn't do

Describe the user story

npm has npm audit signatures since version 8. Would be nice to be able to do that within yarn as well.
https://docs.npmjs.com/cli/v10/commands/npm-audit#audit-signatures

Describe the solution you'd like

Just like I can run yarn npm audit today I'd like to be able to run yarn npm audit signatures.

Describe the drawbacks of your solution

Can't think of any.

Describe alternatives you've considered

For now I guess I'll just run npm audit signatures?