feat: add support for file_opener option in Rust, similiar to #911 (#957)

This ports the enhancement introduced in
https://github.com/openai/codex/pull/911 (and the fixes in
https://github.com/openai/codex/pull/919) for the TypeScript CLI to the
Rust one.

codex-rs/Cargo.lock

@@ -629,8 +629,12 @@ dependencies = [
  "codex-core",
  "color-eyre",
  "crossterm",
+ "lazy_static",
  "mcp-types",
+ "path-clean",
+ "pretty_assertions",
  "ratatui",
+ "regex",
  "serde_json",
  "shlex",
  "strum 0.27.1",
@@ -2468,6 +2472,12 @@ dependencies = [
  "path-dedot",
 ]
 
+[[package]]
+name = "path-clean"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17359afc20d7ab31fdb42bb844c8b3bb1dabd7dcf7e68428492da7f16966fcef"
+
 [[package]]
 name = "path-dedot"
 version = "3.1.1"