Allows the evaluation of an expression with a method call on a static property

[vincentspaa]

Explicitly allows the use of typeof(SomeType).FullName
Adds support for converting a nested workflow-input accessor to a Conductor-friendly ${} string
Example:

_builder.AddTask(
            wf => wf.SomeTask,
            wf =>
                new()
                {
                    Command = AllFormatters.SomeStringFormatter(wf.Input.PrepareOutput.ImportantValue),
                    OutputType = typeof(SomeType).FullName!,
                }
);

(where AllFormatters is assumed to be a static property and SomeStringFormatter a method on said property)

[boma96]

@vincentspaa Thanks for contribution, can you submit at least one test case that demonstrates what is enabled by this code?

[vincentspaa]

@boma96 Very good point, sorry for skipping that. I've added a test case for the primary use-case covered by this PR, the static formatter.
I've had to adjust one test case because $"{wf.GetCustomer.Output.Address}".ToUpperInvariant() becomes legal with this PR. It doesn't work as a user might have intended, but I assumed that it's more important to prevent people from calling methods on workflow properties. So calling wf.GetCustomer.Output.Address.ConvertToSomethingElse() will still be illegal after this PR since it can't and shouldn't be evaluated. And I think there are way more cases where you might inadvertently call a method on an instance of the workflow, as opposed to $"{wf.GetCustomer.Output.Address}".ToUpperInvariant() which feels like a rare edge-case.

[boma96]

I have created a separate PR #204 which implements similar functionality described in this PR and also handles some edge cases we already discussed. Thanks for contribution.