feat: refactor frontend configuration

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/cuddle-please-frontend/src/gatheres/mod.rs

@@ -0,0 +1,9 @@
+mod cli;
+mod config_file;
+mod execution_env;
+mod stdin;
+
+pub use cli::ConfigArgs;
+pub(crate) use config_file::get_config_from_config_file;
+pub(crate) use execution_env::get_from_environment;
+pub(crate) use stdin::get_config_from_stdin;