Implemented basic widget gallery

Cargo.lock

Cargo.toml

src/mavlink.rs

src/mavlink/message_broker.rs

src/ui.rs

src/ui/composable_view.rs

src/ui/panes.rs

src/ui/panes/default.rs

src/ui/panes/messages_viewer.rs

src/ui/panes/plot.rs

src/ui/utils.rs

src/ui/widget_gallery.rs