[feature/2fa] Simplify 2fa features

[laserhybiz]

This PR to feature/2fa branch contains 3 commits for the following:

• Moved migration into user migration (unlike jetstream a new project is not built on top of the base skeleton)
• Use model casts for encryption/decryption
• Run pint

[tnylea]

Thanks, @laserhybiz. Why do you want to move the migrations into the users' migration? My reasoning for keeping it the same is that people will likely want to upgrade, and including a separate file (the 2fa columns migration) will make it easier for users to move files, rather than editing current files.

Let me know your thoughts. Thanks!

[laserhybiz]

@tnylea
I think it depends on how people typically handle updates. In my experience, most applications already have modifications to the original skeleton files. Personally, when I want to update to the latest changes, I prefer editing the current files (commit-by-commit) rather than copying entire files over. In that case, I’d just create a new migration for my project if needed. I think keeping the skeleton clean by updating existing migrations is better than adding separate ones for each change.