[Feature Request] Add "attachments" search filter.

[tapanbavaliya]

Describe the feature you'd like

https://github.com/BookStackApp/BookStack/issues/2129

Describe the benefits this would bring to existing BookStack users

Can the goal of this request already be achieved via other means?

Have you searched for an existing open/closed issue?

• I have searched for existing issues and none cover my fundamental request

How long have you been using BookStack?

Not using yet, just scoping

Additional context