Define General CPP / Rust Naming Conventions

### What

Use the baselibs definitions as base for all https://github.com/eclipse-score/baselibs/blob/main/docs/cpp-style-guide.md

Analyse other available definitions, refine them and store them centrally for S-CORE

### Acceptance Criteria (DoD)

Common set is defined and rolled-out to all Teams

### How

_No response_