Add process guide for migrating packages into the core monorepo

[MajorLift]

Explanation

This document outlines the process for migrating a MetaMask library into the core monorepo. The migration target is assumed to comply with the requirements defined by metamask-module-template and module-lint.

References

• Closes Document migration process for libraries moving to core monorepo #1832

Changelog

N/A

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate

[mcmire]

That's a lot of PRs to have to create for one package 😅 But it all makes sense, and it's nice that many of the PRs will be small.

Thanks for putting this together. This looks really comprehensive. I just had a few suggestions.

[mikesposito]

Looks great!

Nice to see that you also have a detailed preparation phase to outline the steps to be performed prior to the migration, and that there are plenty of example PRs!

[mcmire]

One more thing but otherwise I think this is ready to go!

[mcmire]

Looks good!