Add backoff and jitter for bfx-api requests

[ZIMkaRU]

This PR adds exponential backoff and jitter for bfx-api requests to improve Rate Limit bypassing

---

Here we implement Decorrelated Jitter described in AWS article https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/ And add a small improvement to shift the starting point of jitter for each iteration. In practice, it helps better to move through the Rate Limit for the Sync and Tax Report