[codex][otel] support mtls configuration (#6228)

fix for https://github.com/openai/codex/issues/6153

supports mTLS configuration and includes TLS features in the library
build to enable secure HTTPS connections with custom root certificates.

grpc:
https://docs.rs/tonic/0.13.1/src/tonic/transport/channel/endpoint.rs.html#63
https:
https://docs.rs/reqwest/0.12.23/src/reqwest/async_impl/client.rs.html#516

codex-rs/otel/src/config.rs

@@ -18,16 +18,25 @@ pub enum OtelHttpProtocol {
     Json,
 }
 
+#[derive(Clone, Debug, Default)]
+pub struct OtelTlsConfig {
+    pub ca_certificate: Option<PathBuf>,
+    pub client_certificate: Option<PathBuf>,
+    pub client_private_key: Option<PathBuf>,
+}
+
 #[derive(Clone, Debug)]
 pub enum OtelExporter {
     None,
     OtlpGrpc {
         endpoint: String,
         headers: HashMap<String, String>,
+        tls: Option<OtelTlsConfig>,
     },
     OtlpHttp {
         endpoint: String,
         headers: HashMap<String, String>,
         protocol: OtelHttpProtocol,
+        tls: Option<OtelTlsConfig>,
     },
 }