KCL parser: Allow .prop or [index] to follow any expression (#7371)

Previously in a member expression like `foo.x` or `foo[3]`, `foo` had to be an identifier. You could not do something like `f().x` (and if you tried, you got a cryptic error). Rather than make the error better, we should just accept any expression to be the LHS of a member expression (aka its 'object').

This does knock our "parse lots of function calls" from 58 to 55 calls before it stack overflows. But I think it's fine, we'll address this in https://github.com/KittyCAD/modeling-app/pull/6226 when I get back to it.

Closes https://github.com/KittyCAD/modeling-app/issues/7273

rust/kcl-lib/src/execution/mod.rs

@@ -1949,7 +1949,7 @@ notPipeSub = 1 |> identity(!%))";
             // a runtime error instead.
             parse_execute(code11).await.unwrap_err(),
             KclError::new_syntax(KclErrorDetails::new(
-                "There was an unexpected !. Try removing it.".to_owned(),
+                "There was an unexpected `!`. Try removing it.".to_owned(),
                 vec![SourceRange::new(56, 57, ModuleId::default())],
             ))
         );