(Add) Command to re-encrypt encrypted columns

[Roardom]

Should be ran after rotating the app key.

Depends on #4833.

I debated on hard-coding:

• the table string literal and column string literals,
• the model class-string and column string literals,
• the model class-string and magically figuring out which columns are castable as encrypted
• reflection to find all encrypted columns

I decided on the second option, for the type usage and less magic, although I'm not opposed to the last 2.

The query uses the query builder and not eloquent for less overhead.