[codex] Move config types into codex-config (#16523)

## Why

`codex-rs/core/src/config/types.rs` is a plain config-type module with
no dependency on `codex-core`. Moving it into `codex-config` shrinks the
core crate and gives config-only consumers a more natural dependency
boundary.

## What Changed

- Added `codex_config::types` with the moved structs, enums, constants,
and unit tests.
- Kept `codex_core::config::types` as a compatibility re-export to avoid
a broad call-site migration in this PR.
- Switched notice-table writes in `core/src/config/edit.rs` to a local
`NOTICE_TABLE_KEY` constant.
- Added the `wildmatch` runtime dependency and `tempfile` test
dependency to `codex-config`.

codex-rs/config/src/lib.rs

@@ -11,6 +11,7 @@ mod project_root_markers;
 mod requirements_exec_policy;
 mod skills_config;
 mod state;
+pub mod types;
 
 pub const CONFIG_TOML_FILE: &str = "config.toml";