make the copper app buildable directly from a CopperContext

[gbin]

Today we have a helper basic_copper_setup that sets up all the runtime for copper:

    let copper_ctx = basic_copper_setup(&PathBuf::from(logger_path), SLAB_SIZE, false, None)
        .expect("Failed to setup copper.");

But the generated application from the ron file gets separately the clock and the logger from that context.

    let mut application =
        PtCloudsApplication::new(copper_ctx.clock.clone(), copper_ctx.unified_logger.clone())
            .expect("Failed to create application.");

Maybe we could officialise this CopperContext and just have the generated application from cu29_derive get a context?