feat: add ethers v6 codemods

[Yugal41735]

This PR adds instructions on using the ethers-v6-codemods.

This codemod automates the process of migrating to v6 of ethers.js

You can test/run the codemod using:

npx codemod@latest Ethers/6/Migration-Recipe

This allows Ethers.js v5 users to easily automate the changes mentioned in the migration guide to Ethers v6 with a one-line command.

[Yugal41735]

Hey, If you have any repos in mind, then, I can test it on them, and can let you know about its performance. Feel free to give any suggestions. Thanks.

[ricmoo]

Thanks! This looks super amazing!

[Yugal41735]

Awesome, if you do know any repos, where I can test them, then it would be great.

[Yugal41735]

Hey, I just wanna update, if you want you can also check it on your end, or if you want to provide with some test repos, then I could check and show you the results. Thanks.