refactor: simplify lib.rs and update feature gating for cmd modules

crates/irtt-cli/src/lib.rs

@@ -1,27 +1,6 @@
 #![forbid(unsafe_code)]
 
 pub mod applet;
-pub mod signal;
-
-#[cfg(feature = "client")]
-pub mod shared;
-
-#[cfg(feature = "client")]
 pub mod cmd;
-
-#[cfg(feature = "stats")]
-pub use cmd::client::summary;
-#[cfg(feature = "client")]
-pub use cmd::client::{
-    format_event, format_human_event, format_human_event_with_options, ClientArgs, HumanEventStats,
-    HumanIpdvPair, HumanOutputOptions, OutputMode,
-};
-#[cfg(feature = "tui")]
-pub use cmd::tui::TuiArgs;
-#[cfg(feature = "client")]
-pub use shared::client::{
-    parse_dscp, parse_duration, parse_length, parse_server_fill, parse_test_duration, parse_ttl,
-    ClockArg, CommonClientArgs, ReceivedStatsArg, TimestampArg,
-};
-#[cfg(feature = "client")]
-pub type CliArgs = ClientArgs;
+pub mod shared;
+pub mod signal;