Add support for v1 of Gateway API `HTTPRoute`. Drop support for v1alpha2
as it was deprecated almost a year ago.
Signed-off-by: Sanskar Jaiswal <jaiswalsanskar078@gmail.com>
Adds Gateway API as a provider for progressive traffic shifting, A/B
testing and Blue-Green testing. Adds a new field in the Canary
`spec.service.gatewayRefs` which specifies the Gateway that Flagger
should use.
Signed-off-by: Sanskar Jaiswal <jaiswalsanskar078@gmail.com>