[Feature Request] Signal-with-start and update-with-start

[cretz]

Describe the solution you'd like

In Python and .NET we had assumed the movement was towards reusing the existing start-workflow call for signal/update/whatever-else with start. But the design has shifted away from that and to specific methods, so we should do the same in Ruby. We need the following methods on client:

• signal_with_start_workflow - accepts signal, signal args, required WithStartWorkflowOperation, and returns workflow handle
• start_update_with_start_workflow - accepts update, update args/options, required WithStartWorkflowOperation, and returns update handle
• execute_update_with_start_workflow - accepts update, update args/options, required WithStartWorkflowOperation, and returns update result