Lunny Xiao e72acd5e5b Split migrations folder (#21549) ...

There are too many files in `models/migrations` folder so that I split
them into sub folders.

2022-11-02 16:54:36 +08:00

..

v82.go

…

v83.go

…

v84.go

…

v85.go

…

v86.go

…

v87.go

…