feat: add exponential backoff

[EverVino]

Pull Request description

This PR aims to implement a exponential backoff. pymedx fetch data from a remote server (PubMed). This operation can fail for a myriad of reasons – network issues, server overload, brief disruptions in service, etc. If the application simply gives up after the first failure, it risks missing out on the opportunity to succeed in a subsequent attempt.
This is where retrying comes in as a basic yet crucial mechanism. So in other words If the first attempt did not succeed pymedx will wait for 2 seconds, if the second attempt fail pymedx will wait for 4 seconds and so on, the sequence in waiting times is 0 2 4 8 16 32 32 32 32 (seconds). Notice that is caped at 32 seconds

I added a jitter as well which is added to backoff_time and is a float number between 0 and 1. The addition of a random “jitter” avoids the scenario where many clients, following the same exponential backoff algorithm, retry simultaneously.

• Constants added maxRetires = 10
• New function wait_to_retry

Pull Request checklists

This PR is a:

• bug-fix
• new feature
• maintenance

About this PR:

• it includes tests.
• the tests are executed on CI.
• the tests generate log file(s) (path).
• pre-commit hooks were executed locally.
• this PR requires a project documentation update.

Author's checklist:

• I have reviewed the changes and it contains no misspelling.
• The code is well commented, especially in the parts that contain more
  complexity.
• New and old tests passed locally.

Additional information

Reviewer's checklist

Copy and paste this template for your review's note:

## Reviewer's Checklist

- [ ] I managed to reproduce the problem locally from the `main` branch
- [ ] I managed to test the new changes locally
- [ ] I confirm that the issues mentioned were fixed/resolved .

[EverVino]

@xmnlab ready for a review. This PR add a exponential backoff when request did not succeed

[github-actions]

🎉 This PR is included in version 0.4.0 🎉

The release is available on:

• 0.4.0
• GitHub release

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