FEATURE: Add support for CancellationToken on methods doesn´t have the input parameter

[LBoullosa]

seems in net standard 2.1 there is no cancellation token for some methods

in net 8.0 it´s added cancellation token, so RESTFulSense could be upgraded to NET 8. What do you think about this @cjdutoit @hassanhabib ? The drawback is back compatibility for those who still doesn´t use NET 8 in their projects.