Support agression and min_weight_percent in DestinationRule

[frgaudet]

(This is used to request new product features, please visit https://discuss.istio.io for questions on using Istio)

Describe the feature request
We are using Java micro-services, which usually needs a warmup phase to have the best performance. After testing warmupDurationSecs on production it was not concluant, because of the min_weight_percent that is by default 10%. It is already too much for our service.

Indeed currently DestinationRules only support envoy's slow_start_window :

spec:
  host:app.svc.cluster.local
  trafficPolicy:
    loadBalancer:
      warmupDurationSecs: 2

But the API is lacking aggression and min_weight_percent parameters (cf. envoy doc) which are essentials in our context.

Describe alternatives you've considered

We considered using EnvoyFilter (cf. istio/istio#41039 (comment)); It provides us good technical results but having so much EnvoyFilter to maintain adds a lot of toil.

Affected product area (please put an X in all that apply)

[ ] Configuration Infrastructure
[ ] Docs
[ ] Installation
[X] Networking
[ ] Performance and Scalability
[ ] Policies and Telemetry
[ ] Security
[ ] Test and Release
[ ] User Experience

Additional context

This is a feature I'm ok to implement if this is a something the community really wants.