Add A Retry Policy to `Web3Auth`

[zzhengzhuo]

Background

When I obtain the ID token and use it to retrieve the private key from Web3Auth, some requests fail due to network issues, resulting in the invalidation of the ID token.

Solution

Add a retry policy to Web3Auth to reduce the occurrence of the above issue.

[Esentals81]

To add a retry policy to Web3Auth and reduce errors such as failed logins or connection timeouts, you can implement a simple exponential backoff strategy around the login() function. Web3Auth doesn't expose a built-in retry system, so you'll handle it manually.