feat(models): 🎉 Add GUID field to various models

* Introduced GUID field to Database, Domain, DomainTable, Schema, Table, View, Sequence, Column, Index, Relationship, Constraint, Enum, and Script models.
* Updated initialization functions to assign new GUIDs using uuid package.
* Enhanced DCTX reader and writer to utilize GUIDs from models where available.

pkg/readers/graphql/reader.go

@@ -260,11 +260,7 @@ func (r *Reader) parseType(typeName string, lines []string, schema *models.Schem
 }
 
 func (r *Reader) parseEnum(enumName string, lines []string, schema *models.Schema) {
-	enum := &models.Enum{
-		Name:   enumName,
-		Schema: schema.Name,
-		Values: make([]string, 0),
-	}
+	enum := models.InitEnum(enumName, schema.Name)
 
 	for _, line := range lines {
 		trimmed := strings.TrimSpace(line)