chore: Add jsdoc comments to functions in contract-defs (#2440)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

packages/contracts/src/contract-defs.ts

 import { ethers } from 'ethers'
 
+/**
+ * Gets the hardhat artifact for the given contract name.
+ * Will throw an error if the contract artifact is not found.
+ *
+ * @param name Contract name.
+ * @returns The artifact for the given contract name.
+ */
 export const getContractDefinition = (name: string): any => {
   // We import this using `require` because hardhat tries to build this file when compiling
   // the contracts, but we need the contracts to be compiled before the contract-artifacts.ts
@@ -13,11 +20,24 @@ export const getContractDefinition = (name: string): any => {
   return artifact
 }
 
+/**
+ * Gets an ethers Interface instance for the given contract name.
+ *
+ * @param name Contract name.
+ * @returns The interface for the given contract name.
+ */
 export const getContractInterface = (name: string): ethers.utils.Interface => {
   const definition = getContractDefinition(name)
   return new ethers.utils.Interface(definition.abi)
 }
 
+/**
+ * Gets an ethers ContractFactory instance for the given contract name.
+ *
+ * @param name Contract name.
+ * @param signer The signer for the ContractFactory to use.
+ * @returns The contract factory for the given contract name.
+ */
 export const getContractFactory = (
   name: string,
   signer?: ethers.Signer