Expose Retry Backoff Settings

[guydc]

Version

No response

Is your feature request related to a problem? Please describe.

Currently, envoy retries are fired in [0, 250]ms intervals. By exposing the retry policy backoff settings, it's possible to change the base and max interval.

Describe the solution you'd like

Expose base_interval and max_interval in the gloo retry policy config.

Describe alternatives you've considered

No response

Additional Context

No response