add typia for type validation

tsconfig.json

@@ -9,11 +9,17 @@
 		"skipLibCheck": true,
 		"sourceMap": true,
 		"strict": true,
-		"moduleResolution": "bundler"
+		"moduleResolution": "bundler",
+		"plugins": [
+			{
+				"transform": "typia/lib/transform"
+			}
+		],
+		"strictNullChecks": true
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
 	//
 	// If you want to overwrite includes/excludes, make sure to copy over the relevant includes/excludes
 	// from the referenced tsconfig.json - TypeScript does not merge them in
-}
+}