Add Orm aliases for backward compatibility

Author: MichalLytek

src/index.ts

@@ -1,3 +1,8 @@
 export * from "./decorators/InjectConnection";
 export * from "./decorators/InjectManager";
 export * from "./decorators/InjectRepository";
+
+// deprecated aliases
+export { InjectConnection as OrmConnection } from "./decorators/InjectConnection";
+export { InjectManager as OrmManager } from "./decorators/InjectManager";
+export { InjectRepository as OrmRepository } from "./decorators/InjectRepository";