Add strongly-typed extension methods for SignalWithStart

[Blackburn29]

What was changed

Added extension methods for calling signalWithStart.

Why?

Adds support for strong typings when starting a workflow with a signal.

Currently this requires holding a second variable for WorkflowOptions and calling options.SignalWithStart(x => x.Method()).

These extension methods give you the ability to short-hand the setup:

var handle = await _temporalClient.SignalWorkflowWithStartAsync(
    workflow => workflow.RunAsync(),
    workflow => workflow.SignalMethod(),
    new WorkflowOptions
    {
       //...
    });

Checklist

1. Closes N/A

2. How was this tested: I have been using these extension methods in some of my applications for awhile, but I figured they would be useful to others.

3. Any docs updates needed? N/A