Added request retry mechanism

[ankitdas13]

Fix intermittent connection issue

• In the latest changes, the SDK handles ConnectionError exceptions at the application layer, which ensures retries even when there’s no response from the server.

intermittent connection issue

Exception :   ConnectionError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response')) 

1. Enable/Disable:
   • Retry mechanism is disabled by default
   • Can be enabled with client.enable_retry(True)
2. If enabled:
   a. Number of times to retry:
   Default: 5 retries (defined in DEFAULTS['max_retries'])
   Configurable via constructor parameter

   client = razorpay.Client(auth=("key_id", "key_secret"), max_retries=3)
   

   b. Time period between retries / logic for exponential backoff:
   Uses exponential backoff with jitter
   Default parameters:
   Initial delay: 1 second
   Max delay cap: 60 seconds
   Formula: Each retry doubles the previous delay (delay_seconds *= 2), with added random jitter.
   Jitter is calculated as: jitter_value = random.uniform(-self.jitter, self.jitter)
   Final delay is: delay_seconds * (1 + jitter_value), capped at max_delay
   c. Specific conditions to retry on:
   retries on:
   requests.exceptions.ConnectionError : Network connectivity issues
   requests.exceptions.Timeout : Request timeout errors
   does NOT retry on:
   requests.exceptions.RequestException : Other request exceptions (edited)

[ankitdas13]

ignore these changes, i already created seperate PR for this , which is approved.

[razorpay-sanjib]

LGTM