Resolve calls based on a chains active runtime, and whether or not it is supported

[TarikGul]

With the future addition of #366 the library will need to resolve whether or not calls can be applicable for a specific chain and it's runtime.

It would be nice to have a resolveCall function that can handle a runtimes specific option for certain calls.

Example:

If westend has a new call that was released in its most recent runtime, but that same call is not in kusama yet how do we tell the api to use one over the other in a more verbose and dynamic way.