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/parsing/ast/mod.rs

@@ -2,7 +2,7 @@ pub(crate) mod digest;
 pub mod types;
 
 use crate::{
-    parsing::ast::types::{BinaryPart, BodyItem, Expr, LiteralIdentifier, MemberObject},
+    parsing::ast::types::{BinaryPart, BodyItem, Expr, LiteralIdentifier},
     ModuleId,
 };
 
@@ -57,15 +57,6 @@ impl BinaryPart {
     }
 }
 
-impl MemberObject {
-    pub fn module_id(&self) -> ModuleId {
-        match self {
-            MemberObject::MemberExpression(member_expression) => member_expression.module_id,
-            MemberObject::Identifier(identifier) => identifier.module_id,
-        }
-    }
-}
-
 impl LiteralIdentifier {
     pub fn module_id(&self) -> ModuleId {
         match self {