Add CONST_ITEM_MUTATION lint

Fixes #74053
Fixes #55721

This PR adds a new lint `CONST_ITEM_MUTATION`.
Given an item `const FOO: SomeType = ..`, this lint fires on:

* Attempting to write directly to a field (`FOO.field = some_val`) or
  array entry (`FOO.array_field[0] = val`)
* Taking a mutable reference to the `const` item (`&mut FOO`), including
  through an autoderef `FOO.some_mut_self_method()`

The lint message explains that since each use of a constant creates a
new temporary, the original `const` item will not be modified.

compiler/rustc_mir_build/src/build/expr/as_constant.rs

@@ -21,7 +21,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         let Expr { ty, temp_lifetime: _, span, kind } = expr;
         match kind {
             ExprKind::Scope { region_scope: _, lint_level: _, value } => this.as_constant(value),
-            ExprKind::Literal { literal, user_ty } => {
+            ExprKind::Literal { literal, user_ty, const_id: _ } => {
                 let user_ty = user_ty.map(|user_ty| {
                     this.canonical_user_type_annotations.push(CanonicalUserTypeAnnotation {
                         span,