Add NameOf utilty function for workflows and tasks

[boma96]

NameOf function is compiled to constant string corresponding to Name property of conductor object(workflow, subworkflow or simple task).

Example:

builder.AddTask(wf => wf.Task,
                wf => new()
                {
                    InterpolatedWfName = $"WfName: {NamingUtil.NameOf<SimpleTaskExample>()}",
                    WorkflowName = NamingUtil.NameOf<WfExample>()
                });

[ognjenkatic]

LG