Rust: Rename OperationImpl -> Impl.

Author: geoffw0

rust/ql/lib/codeql/rust/elements/Operation.qll

@@ -2,7 +2,7 @@
  * Provides classes for operations.
  */
 
-import internal.OperationImpl
+import internal.OperationImpl::Impl as OperationImpl
 private import codeql.rust.elements.internal.ExprImpl::Impl as ExprImpl
 
 final class Operation = OperationImpl::Operation;

rust/ql/lib/codeql/rust/elements/internal/OperationImpl.qll

@@ -11,7 +11,7 @@ private import codeql.rust.elements.internal.ExprImpl::Impl as ExprImpl
  * INTERNAL: This module contains the customizable definition of `Operation` and should not
  * be referenced directly.
  */
-module OperationImpl {
+module Impl {
   /**
    * An operation, for example `&&`, `+=`, `!` or `*`.
    */