feat: Add maxRetries configuration for credential renewal (iOS)

[subhankarmaiti]

Adds automatic retry mechanism with exponential backoff for credential renewal to improve reliability in unstable network conditions. This addresses issue #1374 where refresh token rotation can fail due to transient network errors.

Changes

• Added maxRetries option to Auth0Options interface
• Updated iOS native bridge to pass maxRetries to CredentialsManager initialization
• Updated Android bridge to accept parameter (ignored due to SDK limitation)
• Updated documentation with configuration examples

Platform Support

• iOS only: ✅ Full support via Auth0.swift v2.16.2+

Usage

const auth0 = new Auth0({
  domain: 'YOUR_DOMAIN',
  clientId: 'YOUR_CLIENT_ID',
  maxRetries: 2, // Retry up to 2 times on transient errors (iOS only)
});

With React Hooks:

<Auth0Provider domain="..." clientId="..." maxRetries={2}>
  <App />
</Auth0Provider>

Retry Behavior

Automatically retries on:

• Network errors (timeouts, DNS failures)
• Rate limiting (HTTP 429)
• Server errors (HTTP 5xx)

Does NOT retry on:

• Invalid/expired/revoked refresh tokens
• Client errors (HTTP 4xx except 429)