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

..

v76.go

…

v77.go

…

v78.go

…

v79.go

…

v80.go

…

v81.go

…