Reorder all serde_bincode_compat module definitions

[shekhirin]

Describe the feature

We have a bunch of serde_bincode_compat modules across the crates, and most of them are defined after the tests module. It's weird and we should reorder it, so that mod tests goes last.

For example:

reth/crates/primitives/src/transaction/mod.rs

Lines 1970 to 1982 in a07efa7

	#[test]
	fn create_txs_disallowed_for_eip4844() {
	let data =
	[3, 208, 128, 128, 123, 128, 120, 128, 129, 129, 128, 192, 129, 129, 192, 128, 128, 9];
	let res = TransactionSigned::decode_2718(&mut &data[..]);
	assert!(res.is_err());
	}
	}
	/// Bincode-compatible transaction type serde implementations.
	#[cfg(feature = "serde-bincode-compat")]
	pub mod serde_bincode_compat {

Additional context

No response

[varun-doshi]

I can take this up