fix(client): Reexport WorkflowExecutionAlreadyStartedError from @temporalio/client (#1498)

Author: mjameswh

packages/client/src/index.ts

@@ -22,6 +22,7 @@ export {
   TemporalFailure,
   TerminatedFailure,
   TimeoutFailure,
+  WorkflowExecutionAlreadyStartedError,
 } from '@temporalio/common';
 export { TLSConfig } from '@temporalio/common/lib/internal-non-workflow';
 export * from '@temporalio/common/lib/errors';