fix(command-flow): add missing flow exports

Author: Char2sGu

packages/command-flow/src/index.ts

@@ -2,6 +2,7 @@ export * from './buses';
 export * from './core';
 export * from './facade';
 export * from './factories';
+export * from './flow';
 export * from './handlers';
 export * from './pseudo-type';
 export * from './scheduler';