Ignore module_name_repetitions pedantic clippy lint in codegen

    warning: item name ends with its containing module's name
     --> src/cfg.rs:5:10
      |
    5 | pub enum DocCfg {
      |          ^^^^^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#module_name_repetitions
      = note: `-W clippy::module-name-repetitions` implied by `-W clippy::pedantic`
      = help: to override `-W clippy::pedantic` add `#[allow(clippy::module_name_repetitions)]`

codegen/src/main.rs

@@ -13,6 +13,7 @@
     clippy::items_after_statements,
     clippy::manual_let_else,
     clippy::match_like_matches_macro,
+    clippy::module_name_repetitions,
     clippy::similar_names,
     clippy::too_many_lines,
     clippy::uninlined_format_args