Improvement: Add Field support for GenericSkeleton

### What

Goal: `score::mw::com::impl::GenericSkeleton` currently only supports (when https://github.com/eclipse-score/communication/issues/76 is solved) Event communication. Since now also Fields are available it shall be extended with `GenericSkeletonField` support.
It makes sense to wait until typed `SkeletonField`s do have Get/Set support, which should be there soon!

### How

Introduce a `GenericSkeletonField`. It should be similar to `GenericSkeletonEvent` and just like the typed SkeletonField also a composite of a GenericSkeletonEvent and up to two GenericSkeletonMethods for get/set.

Depends on: https://github.com/eclipse-score/communication/issues/179

### Estimates for realization

2 weeks

### Category

- [x] Affects Detailed Design

### Requirements / Architecture

- [x] Requirements / Architecture are not affected by this change?