feat: with retry helper

[wangyb-A]

Issue #, if available: #361

Ref pr: aws/aws-durable-execution-sdk-js#505

Description

• Runs func(ctx, attempt) starting at attempt = 1.
• On rejection → calls retryStrategy. If shouldRetry: true, context.waits for the returned delay, then re-runs the whole function.
• On fulfillment → returns the value.
• On the final failure → rethrows.
• By default wraps the loop in context.runInChildContext for isolation and so all attempts + backoff waits appear as a single grouped operation in execution history. Opt out via wrap_with_run_in_child_context = false

Description of changes:

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