Turbopack: bincode: Add crate with bincode serialization helpers (#85878)

Add helpers for using bincode with various commonly-used foreign types that do not implement `bincode::Encode`/`bincode::Decode`. We can't implement the bincode traits on these types ourselves because of the orphan rules.

This is pulled out of #85878 to make it easier to review.

This depends on my fork of bincode here: https://github.com/bgw/bincode/commits/bgw/patches/
Specifically, the `with =` attribute I added here: bgw/bincode@4103717

This behaves like the serde equivalent: https://serde.rs/field-attrs.html#with

I am working on trying to get the changes with the bincode fork upstreamed. I submitted a bugfix (bgw/bincode@9247286) via email to the maintainer to start. Upstream is hosted at https://git.sr.ht/~stygianentity/bincode and my fork there is at https://git.sr.ht/~bgw/bincode .

Author: bgw

Cargo.lock

@@ -293,6 +293,7 @@ next-taskless = { path = "crates/next-taskless" }
 
 # Turbopack
 auto-hash-map = { path = "turbopack/crates/turbo-tasks-auto-hash-map" }
+turbo-bincode = { path = "turbopack/crates/turbo-bincode" }
 turbo-prehash = { path = "turbopack/crates/turbo-prehash" }
 turbo-rcstr = { path = "turbopack/crates/turbo-rcstr" }
 turbo-dyn-eq-hash = { path = "turbopack/crates/turbo-dyn-eq-hash" }
@@ -359,6 +360,7 @@ preset_env_base = "6.0.0"
 
 
 # General Deps
+bincode = { version = "2.0.1", features = ["serde"] }
 chromiumoxide = { version = "0.5.4", features = [
   "tokio-runtime",
 ], default-features = false }
@@ -481,4 +483,5 @@ webbrowser = "1.0.6"
 inventory = "0.3.21"
 
 [patch.crates-io]
+bincode = { git = "https://github.com/bgw/bincode.git", branch = "bgw/patches" }
 mdxjs = { git = "https://github.com/mischnic/mdxjs-rs.git", branch = "swc-core-32" }

Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "turbo-bincode"
+version = "0.0.0"
+description = "Utilities for bincode used in turbo-tasks and turbopack"
+license = "MIT"
+edition = "2024"
+
+[lib]
+
+[lints]
+workspace = true
+
+[dependencies]
+bincode = { workspace = true }
+either = { workspace = true }
+indexmap = { workspace = true }
+mime = { workspace = true }
+ringmap = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+smallvec = { workspace = true }