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Issue Link, if available

Fixes: #355

Description

Add a public WithRetry helper that retries any durable operation (waitForCallback, invoke, waitForCondition, etc.) end-to-end with configurable backoff. Today users have to hand-roll a while loop with manual context.wait() backoff calls. This helper provides a single, replay-safe, well-tested primitive for that pattern, reusing the exact same RetryStrategy shape developers already know from StepConfig.

New files:

• withRetryConfig (sdk/.../config/) — Builder-pattern config holding the RetryStrategy (same type as StepConfig) and wrapInChildContext (defaults to true). If RetryStrategy is not specified a default RetryStrategy is used.

Key behaviors:

• Reuses the existing RetryStrategy / RetryDecision types — zero new retry concepts.
• Replay-safe by construction: every side-effect in the loop is a durable operation (operation.execute() calls durable primitives, context.wait() handles backoff).
• Correctly propagates SuspendExecutionException and UnrecoverableDurableExecutionException without retrying — these are internal SDK control flow signals.
• withRetry and withRetryAsync(context, name, operation, config)— wraps inrunInChildContext` by default for clean execution history grouping.

Demo/Screenshots

N/A

Checklist

• I have filled out every section of the PR template
• I have thoroughly tested this change

Testing

Unit Tests

yes

Integration Tests

yes

Examples

Yes.

yes