Account creation with Google auto-generates username

### Feature Request

### Problem / Opportunity

Several patrons have complained that they were not able to choose a username when creating an account with Google. The username is auto-generated and is not able to be changed.

Patrons don't always want to use the same name on Open Library as is associated with their Google accounts.

The problem is solved when patrons are prompted to enter their chosen usernames when creating an account with Google.

### Proposal

### Breakdown

### Related files

Refer to [this map of common Endpoints](https://github.com/internetarchive/openlibrary/wiki/Endpoints):
*

### Requirements Checklist
Checklist of requirements that need to be satisfied in order for this issue to be closed:
* [ ]

### Stakeholders

*

### Instructions for Contributors

* **Before** [creating a new branch](https://github.com/internetarchive/openlibrary/wiki/Git-Cheat-Sheet#making-changes-and-creating-a-pull-request) or pushing up changes to a PR, please first [run these commands](https://github.com/internetarchive/openlibrary/wiki/Git-Cheat-Sheet#working-on-your-branch) to ensure your repository is up to date, as the pre-commit bot may add commits to your PRs upstream.