Allow Manual Username Selection During Google SSO Registration

[shraga100]

I'm using the nodebb-plugin-sso-google.
after installing and configuring the plugin, the registration process for users logging in via their Google account automatically creates a username that matches the user's Google account username. Since I have disabled NodeBB's built-in feature to change the username post-registration, users are not given the opportunity to choose a custom username. This limits their ability to maintain anonymity.

Proposed Solution

• Add an option for users to manually select a username during the Google SSO registration process.
• Allow the user to select and confirm their username before finalizing the registration process, ensuring that the final username is a conscious choice by the user.

Steps to Reproduce

1. Install and configure the nodebb-plugin-sso-google according to the documentation.
2. Complete the registration process using a Google account.
3. Notice that the username is automatically generated based on the Google account, with no opportunity for the user to choose a custom username.

Any updates, fixes, or further guidance regarding this issue would be greatly appreciated. Thank you!