Package v2 update

[PredaaA]

Update the codebase entirely. This means many breaking changes, which will needs to be documented.

Things to do:

• Update the Http client to include all routes.
• Add ratelimits handling (whenever it happens).
• Refactor the client.
• Add tests.

[oriel-beck]

You can delay the ratelimit handling until /search is out of beta, take your time.