Decouple printing and environment parsing from CLI

[orecham]

Brief Description

The current CLI used in iceoryx2-cli and some examples utilizes clap with default features, which is coupled to the standard library environment parsing and printing mechanisms.

Separating these concerns from the cli core would allow for the CLI to be used in environments where the standard library is not available.

Options to consider:

1. Use clap without standard library features combined with argument parsing and printing mechanisms that do not depend on the standard library
2. Implement own CLI with no standard library dependency