Improvement: Add Field support for GenericProxy

### What

Goal: `score::mw::com::impl::GenericProxy` currently only supports Event communication. Since now also Fields are available it shall be extended with GenericProxyField support.
It makes sense to wait until typed ProxyFields do have Get/Set support, which should be there soon!

### How

Introduce a `GenericProxyField`. It should be similar to GenericProxyEvent and just like the typed ProxyField also a composite of a `GenericProxyEvent` and up to two `GenericProxyMethods` for get/set.

### Estimates for realization

2 weeks

### Category

- [x] Affects Detailed Design

### Requirements / Architecture

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