chore: put crypto provider logic in a shared crate (#11294)

Ensures a process-wide rustls crypto provider is installed.

Both the `codex-network-proxy` and `codex-api` crates need this.

codex-rs/utils/rustls-provider/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "codex-utils-rustls-provider"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[lints]
+workspace = true
+
+[dependencies]
+rustls = { workspace = true }