Is your feature request related to a problem? Please describe.

Currently, a workflow cannot provide context specific information to the construction of an MCP server, it had to have been defined at the worker level through a factory callable with no arguments. This doesn't allow the user to create the server in different ways depending on the workflow.

Describe the solution you'd like

Ability to provide some additional data to the mcp server reference which is then provided to the factory callable.

Additional context