refactor: HL EVM signing via sonirico/go-hyperliquid SDK

hl_helper/node_modules/ethers/src.ts/utils/rlp.ts

@@ -0,0 +1,20 @@
+/**
+ *  The [[link-rlp]] (RLP) encoding is used throughout Ethereum
+ *  to serialize nested structures of Arrays and data.
+ *
+ *  @_subsection api/utils:Recursive-Length Prefix  [about-rlp]
+ */
+
+export { decodeRlp } from "./rlp-decode.js";
+export { encodeRlp } from "./rlp-encode.js";
+
+/**
+ *  An RLP-encoded structure.
+ */
+export type RlpStructuredData = string | Array<RlpStructuredData>;
+
+/**
+ *  An RLP-encoded structure, which allows Uint8Array.
+ */
+export type RlpStructuredDataish = string | Uint8Array | Array<RlpStructuredDataish>;
+