feat: split codex-common into smaller utils crates (#11422)

We are removing feature-gated shared crates from the `codex-rs`
workspace. `codex-common` grouped several unrelated utilities behind
`[features]`, which made dependency boundaries harder to reason about
and worked against the ongoing effort to eliminate feature flags from
workspace crates.

Splitting these utilities into dedicated crates under `utils/` aligns
this area with existing workspace structure and keeps each dependency
explicit at the crate boundary.

## What changed

- Removed `codex-rs/common` (`codex-common`) from workspace members and
workspace dependencies.
- Added six new utility crates under `codex-rs/utils/`:
  - `codex-utils-cli`
  - `codex-utils-elapsed`
  - `codex-utils-sandbox-summary`
  - `codex-utils-approval-presets`
  - `codex-utils-oss`
  - `codex-utils-fuzzy-match`
- Migrated the corresponding modules out of `codex-common` into these
crates (with tests), and added matching `BUILD.bazel` targets.
- Updated direct consumers to use the new crates instead of
`codex-common`:
  - `codex-rs/cli`
  - `codex-rs/tui`
  - `codex-rs/exec`
  - `codex-rs/app-server`
  - `codex-rs/mcp-server`
  - `codex-rs/chatgpt`
  - `codex-rs/cloud-tasks`
- Updated workspace lockfile entries to reflect the new dependency graph
and removal of `codex-common`.

codex-rs/cli/src/mcp_cmd.rs

@@ -5,8 +5,6 @@ use anyhow::Result;
 use anyhow::anyhow;
 use anyhow::bail;
 use clap::ArgGroup;
-use codex_common::CliConfigOverrides;
-use codex_common::format_env_display::format_env_display;
 use codex_core::config::Config;
 use codex_core::config::edit::ConfigEditsBuilder;
 use codex_core::config::find_codex_home;
@@ -19,6 +17,8 @@ use codex_core::mcp::auth::oauth_login_support;
 use codex_core::protocol::McpAuthStatus;
 use codex_rmcp_client::delete_oauth_tokens;
 use codex_rmcp_client::perform_oauth_login;
+use codex_utils_cli::CliConfigOverrides;
+use codex_utils_cli::format_env_display::format_env_display;
 
 /// Subcommands:
 /// - `list`   — list configured servers (with `--json`)