Add GetPagingArguments method to IResolverContext

[tobias-tengler]

At the moment I have to get arguments like "first" from the context myself.

var first = context.ArgumentValue<int?>("first");

All of this is already handled inside the PagingHandlers. We could extract this logic and make it accessible to consumers of the library.

I propose to add a new extension method like GetPagingArguments to the IResolverContext, which would return the CursorPagingArguments. (GetOffsetPagingArguments respectively)

This would match AddPagingArguments nicely and would reduce boilerplate.

I think it could also be helpful, if these methods validate the arguments against the configured PagingOptions, i.e. DefaultPagingSize and MaxPagingSize.

[stale]

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