feat(ui): 🎉 Add import and merge database feature

- Introduce a new screen for importing and merging database schemas.
- Implement merge logic to combine schemas, tables, columns, and other objects.
- Add options to skip specific object types during the merge process.
- Update main menu to include the new import and merge option.

pkg/ui/main_menu.go

@@ -39,6 +39,9 @@ func (se *SchemaEditor) createMainMenu() tview.Primitive {
 		AddItem("Manage Domains", "View, create, edit, and delete domains", 'd', func() {
 			se.showDomainList()
 		}).
+		AddItem("Import & Merge", "Import and merge schema from another database", 'i', func() {
+			se.showImportScreen()
+		}).
 		AddItem("Save Database", "Save database to file or database", 'w', func() {
 			se.showSaveScreen()
 		}).