feat(contract_manager): add generate set fee payload script to contract manager (#1563)

* add generate set fee payload script to contract manager

* address comments

contract_manager/scripts/generate_governance_set_fee_payload.ts

@@ -0,0 +1,41 @@
+import yargs from "yargs";
+import { hideBin } from "yargs/helpers";
+import { DefaultStore } from "../src";
+import { Chain } from "../src/chains";
+
+const parser = yargs(hideBin(process.argv))
+  .usage("Usage: $0 --chain <chain_id> --fee <fee> --exponent <exponent>")
+  .options({
+    chain: {
+      type: "string",
+      demandOption: true,
+      desc: "Chain for which to generate the Set Fee payload",
+    },
+    fee: {
+      type: "number",
+      demandOption: true,
+      desc: "The new fee to set",
+    },
+    exponent: {
+      type: "number",
+      demandOption: true,
+      desc: "The new fee exponent to set",
+    },
+  });
+
+async function main() {
+  const { chain, fee, exponent } = await parser.argv;
+
+  const chain_obj = DefaultStore.chains[chain];
+  if (!chain_obj) {
+    throw new Error(`Chain with ID '${chain}' does not exist.`);
+  }
+
+  const payload = chain_obj.generateGovernanceSetFeePayload(fee, exponent);
+  console.log(
+    `Generated payload for chain ${chain_obj}:`,
+    payload.toString("hex")
+  );
+}
+
+main();