Add egui_extras dependency

Adds `egui_extras` to Cargo.toml and Cargo.lock to enable enhanced table
widgets.
Also introduces a new `StateTab` enum and integrates the
`egui_extras::TableBuilder` to display global variables in a structured
table within the application's state panel. This enhances the debugging
and introspection capabilities of the compiler UI by providing a clear
view of the environment's global state.

Cargo.toml

@@ -6,6 +6,7 @@ default-run = "myc"
 
 [dependencies]
 eframe = "0.33.3"
+egui_extras = "0.33"
 clap = { version = "4.5", features = ["derive"] }
 chrono = "0.4"
 regex = "1.10"