Retry Policy for GRPCRoute

[shadialtarsha]

What would you like to be added:
A new field retry needs to be added to GRPCRouteRule which allows specifying the retry policy for a gRPC endpoint https://grpc.io/docs/guides/retry/

Why this is needed:
The current API of the GRPCRoute does not include a mechanism for specifying retry policies:

1. The addition of a retry policy allows services to automatically recover from transient failures without additional complexity in client implementations.
2. Ensures developers can implement retry strategies consistently across services.

[shadialtarsha]

Discussed this in the #sig-netwrok-gateway-api channel with @mikemorris and mentioned that this was originally part of GEP-1731 but it got dropped for scope and time.

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle stale
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale