Support dynamic new value creation for metadata value migration

src/modules/metadata/Metadata.types.ts

@@ -21,7 +21,7 @@ export interface IMetadataMigration {
          */
         key?: string;
         oldValue: string | RegExp;
-        newValue: string;
+        newValue: string | ((oldValue: string) => string);
     }[];
     keys?: { oldKey: string; newKey: string }[];
 }

src/modules/metadata/services/MetadataMigrations.ts

@@ -60,7 +60,7 @@ const applyMetadataValueMigration = (meta: Metadata, migration: IMetadataMigrati
     metadataValueChanges.forEach(({ key, oldValue, newValue }) => {
         const migrateValue = (metaKey: string) => {
             if (meta[metaKey].match(oldValue)) {
-                migratedMetadata[metaKey] = newValue;
+                migratedMetadata[metaKey] = typeof newValue === 'function' ? newValue(meta[metaKey]) : newValue;
             }
         };