feat: Update database models to use DatabaseV2 instead of DataSourceV2

This commit updates the database models and related functions to use the new DatabaseV2 struct instead of the deprecated DataSourceV2 struct. This change ensures consistency and clarity in the codebase.

core/entity/database.go

@@ -0,0 +1,25 @@
+package entity
+
+type DatabaseMetadata struct {
+	Databases []Database `json:"databases"`
+}
+
+type Database struct {
+	Name   string          `json:"name"`
+	Tables []DatabaseTable `json:"tables"`
+}
+
+type DatabaseTable struct {
+	Name    string           `json:"name"`
+	Columns []DatabaseColumn `json:"columns"`
+}
+
+type DatabaseColumn struct {
+	Name     string           `json:"name"`
+	Type     string           `json:"type"`
+	Null     bool             `json:"null,omitempty"`
+	Key      string           `json:"key,omitempty"`
+	Default  string           `json:"default,omitempty"`
+	Extra    string           `json:"extra,omitempty"`
+	Children []DatabaseColumn `json:"children,omitempty"`
+}