refactor: use dialect-neutral Jet type aliases

Replace mysql/postgres intersection interfaces with mysql type aliases
per go-jet/jet#555 and generalize Apply/Expr signatures.

Co-authored-by: Cursor <cursoragent@cursor.com>

jet_expr.go

@@ -6,19 +6,19 @@ import (
 	"github.com/go-jet/jet/v2/mysql"
 )
 
-// ExprValues converts a list of values to a list of mysql.Expression values using
+// ExprValues converts a list of values to a list of Expression values using
 // function f to transform the values (mysql.String for strings, mysql.Uint64, etc).
-func ExprValues[T any](values []T, f func(T) mysql.Expression) []mysql.Expression {
-	expressions := make([]mysql.Expression, len(values))
+func ExprValues[T any](values []T, f func(T) Expression) []Expression {
+	expressions := make([]Expression, len(values))
 	for i, v := range values {
 		expressions[i] = f(v)
 	}
 	return expressions
 }
 
-// ExprStringers converts a list of fmt.Stringers to a list of mysql.Expression values.
-func ExprStringers(values []fmt.Stringer) []mysql.Expression {
-	expressions := make([]mysql.Expression, len(values))
+// ExprStringers converts a list of fmt.Stringers to a list of Expression values.
+func ExprStringers(values []fmt.Stringer) []Expression {
+	expressions := make([]Expression, len(values))
 	for i, v := range values {
 		expressions[i] = mysql.String(v.String())
 	}