Wrapped FunctionOp using Converters

Hi @ctrueden,

there is some problem with `FunctionOp`s which are discovered using the `OpService`. Assume that I try to resolve a `FunctionOp` based on an input of type `A` and some output of type `O`. The `OpService` finds an `FunctionOp` `B to O` as there exists a converter from `A` to `B`. However, the resulting `FunctionOp` will only accept `A`s in the `compute(A in)`. Shouldn't the `OpService` wrap the orginal `FunctionOp`, such that the wrapped `FunctionOp` uses a converter inside the `compute(B...)`.

Does this make sense?