chore: no_std in reth-codec (paradigmxyz#9587)

Author: nkysg

Cargo.toml

@@ -390,7 +390,7 @@ alloy-primitives = "0.7.2"
 alloy-dyn-abi = "0.7.2"
 alloy-sol-types = "0.7.2"
 alloy-rlp = "0.3.4"
-alloy-trie = "0.4"
+alloy-trie = { version = "0.4", default-features = false }
 alloy-rpc-types = { version = "0.2", default-features = false, features = [
     "eth",
 ] }

crates/storage/codecs/Cargo.toml

@@ -19,12 +19,12 @@ alloy-consensus = { workspace = true, optional = true }
 alloy-eips = { workspace = true, optional = true }
 alloy-genesis = { workspace = true, optional = true }
 alloy-primitives.workspace = true
-alloy-trie.workspace = true
+alloy-trie = { workspace = true, optional = true }
 
 # misc
 bytes.workspace = true
 modular-bitfield = { workspace = true, optional = true }
-serde.workspace = true
+serde = { workspace = true, optional = true }
 
 [dev-dependencies]
 alloy-eips = { workspace = true, default-features = false, features = [
@@ -43,10 +43,11 @@ proptest-arbitrary-interop.workspace = true
 
 [features]
 default = ["std", "alloy"]
-std = ["alloy-primitives/std", "bytes/std"]
+std = ["alloy-primitives/std", "bytes/std", "serde/std"]
 alloy = [
     "dep:alloy-consensus",
     "dep:alloy-eips",
     "dep:alloy-genesis",
     "dep:modular-bitfield",
+    "dep:alloy-trie",
 ]

crates/storage/codecs/src/lib.rs

@@ -22,6 +22,11 @@ pub use reth_codecs_derive::*;
 use alloy_primitives::{Address, Bloom, Bytes, FixedBytes, U256};
 use bytes::Buf;
 
+#[cfg(not(feature = "std"))]
+extern crate alloc;
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
 #[cfg(any(test, feature = "alloy"))]
 mod alloy;