Implement RetryBudget in Gateway API

[howardjohn]

Pending Envoy support. Ref kubernetes-sigs/gateway-api#3573 (comment)

Originally posted by @keithmattix in #55545 (comment)

[zirain]

assign this to me, as I need to do same thing in EG.

[zirain]

@mikemorris with current envoy API, we need to skip interval(in budget detail and minRetryRate) when implementing before upstream support it?

[mikemorris]

Implementing this will require a minor addition to Envoy APIs as described at kubernetes-sigs/gateway-api#3573 (comment)

/cc @ericdbishop

[zirain]

Implementing this will require a minor addition to Envoy APIs as described at kubernetes-sigs/gateway-api#3573 (comment)

/cc @ericdbishop

should we partial implement without it? I know some users show interesting with this without ttl.

cc @ramaraochavali