feat(upload): add exponential backoff to retry logic

[DarkLord017]

This pull request updates the polling logic in the StorageContext class to use exponential backoff with jitter when waiting for a piece to be "parked" (ready).

Fixes #293

Improvements to polling and retry logic:

• Replaced the fixed polling interval with an exponential backoff strategy, introducing a baseDelay, maxDelay, and an attempt counter to increase the delay between retries.
• Added random jitter to each backoff delay to help prevent synchronized retries and further reduce contention.