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

..

main_test.go

…

v211.go

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v212.go

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v213.go

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v214.go

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v215.go

…

v216.go

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v217.go

…

v218.go

…

v219.go

…

v220.go

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v221_test.go

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v221.go

…

v222.go

…

v223.go

…