Merge branch 'main' of github.com:go-gorm/sharding

feat: Support for AutoMigrate (go-gorm#17)

Merge pull request go-gorm#13 from go-gorm/feature/read-write-connect…

…ions

Update README

Split primary_key gen as single file

Merge pull request go-gorm#5 from go-gorm/feature/pk

Move keygen to github.com/longbridgeapp/longkey

Use DoubleWrite until a better name

Merge pull request go-gorm#4 from go-gorm/feature/config

improve config

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