feat: implement rlp decoding for common types

crates/core/src/lib.rs

@@ -1,4 +1,4 @@
-pub use ethereum_types::*;
 pub mod rlp;
+pub use ethereum_types::*;
 pub mod serde_utils;
 pub mod types;

crates/core/src/rlp.rs

@@ -1 +1,4 @@
+pub mod constants;
+pub mod decode;
 pub mod encode;
+pub mod error;

crates/core/src/rlp/constants.rs

@@ -0,0 +1,2 @@
+pub const RLP_NULL: u8 = 0x80;
+pub const RLP_EMPTY_LIST: u8 = 0xC0;