Feature: Add rate limiter to Loopring API requests

[0xGeel]

TL;DR:

• Introducing a Rate Limiter for requests made to the Loopring API.
• Updated the error messages, and added a to notify end-users of errors.

Why?

• Hitting the API Rate Limit caused a bug for users that connected with a wallet that contained a lot (800+) NFTs. This caused the Loopring API requests to return a HTTP 429 error, resulting in not all NFTs being included in the access verification.