Implement a new AUTH_PRE_REGISTER logical theme event, intended to allow custom logic for registration events #4833

Describe the feature you'd like

Allow users to manually specify whether or not they want to auto register OIDC authorized users.

This is similar to #2174 but for OIDC instead of SAML

Describe the benefits this would bring to existing BookStack users

Currently if you set up OIDC, anyone who attempts to log in with your provider will have a profile created for them if it doesn't exist. This feature would disable auto user creation and allow you to specify users in the user table

• OIDC_AUTO_REGISTER=true - would have the same behavior as it does now
• OIDC_AUTO_REGISTER=false - would require a user to be in the user table before granting access

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

This can be manually modded into bookstacks by editing the source code as shown in my PR #4831.

Although having it bundled into the releases would be nice.

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?

Under 3 months

Additional context

No response