add global columnNameMapCache and global modelInstanceCache (#27)

* add global columnNameMapCache and global modelInstanceCache

Author: xgxiang

go.mod

@@ -3,20 +3,12 @@ module github.com/acmestack/gorm-plus
 go 1.18
 
 require (
-	github.com/dave/jennifer v1.4.0
-	github.com/spf13/cobra v0.0.5
 	gorm.io/driver/mysql v1.4.4
 	gorm.io/gorm v1.24.2
-	sigs.k8s.io/controller-tools v0.2.8
 )
 
 require (
 	github.com/go-sql-driver/mysql v1.6.0 // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
-	golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72 // indirect
-	gopkg.in/yaml.v2 v2.2.4 // indirect
-	sigs.k8s.io/yaml v1.1.0 // indirect
 )