Convert HTTPRoute custom filters into Kong Route plugins

[mlavacca]

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Problem Statement

The ingress way of configuring plugins on Kong routes is annotations-oriented. HTTPRoute provides a way of defining custom filters on HTTPRouteRules and we should leverage it to let users configure plugins. This happens through the ExtensionRef field.

Proposed Solution

• Validate The ExtensionRef field to contain only KongPlugin resources
• convert the referenced plugins into Kong route plugins

Additional information

No response

Acceptance Criteria

• As a user, by referencing KongPlugins via HTTPRoute ExtensionRef, I'm able to configure plugins in Kong Routes.