[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/Cargo.lock

@@ -1803,11 +1803,13 @@ dependencies = [
  "serde_json",
  "serde_path_to_error",
  "sha2",
+ "tempfile",
  "thiserror 2.0.18",
  "tokio",
  "toml 0.9.11+spec-1.1.0",
  "toml_edit 0.24.0+spec-1.1.0",
  "tracing",
+ "wildmatch",
 ]
 
 [[package]]
@@ -1936,7 +1938,6 @@ dependencies = [
  "uuid",
  "walkdir",
  "which 8.0.0",
- "wildmatch",
  "windows-sys 0.52.0",
  "wiremock",
  "zip",