Expose start delay in child workflow options

[dhiaayachi]

See temporalio/features#515 for more information

[dhiaayachi]

This is a feature request. Thanks for suggesting this feature! To work around this feature you can set the search attribute on the Workflow when you start the Workflow Execution. You can also add the search attribute from within your Workflow using UpsertSearchAttributes. You can use temporal workflow list to query Workflow Executions by search attribute. See Temporal CLI Workflow command reference.