split coupler atmos configs

[LenkaNovak]

After #388 we will want to split atmos and coupler configuration, so different toml files / set of dictionaries can be used to initialize Atmos, as well as the defaults. The coupler defaults are still in the cli_options.jl and called as parsed_args, but now the parsed_args get overwritten by the setup args in the config toml files. Whatever args are specified in the coupler also overwrite the args in the component models.

• split the files in the driver config
• test that non-default atmos params can be called
• ensure changes applied in pipeline.yml, longruns/pipeline.yml (delete the perf configs, if possible)