Integrate WPGraphQL Smart Cache with Webhook Plugin

[theodesp]

Description

As a headless developer, I want to integrate WPGraphQL Smart Cache with the existing webhook plugin to enable on-demand cache invalidation whenever content or configuration changes occur in WordPress.

Acceptance criteria

• The webhook event manager detects and listens to WPGraphQL Smart Cache purge events (wpgraphql_cache_purge_nodes and graphql_purge) instead of native WordPress action hooks.

• Webhook payloads include WPGraphQL Smart Cache keys to enable precise on-demand cache invalidation.

• If Smart Cache keys are not available, the webhook payload includes the URI path for invalidation fallback.

• The system supports multiple event subscriptions per webhook entry, leveraging Smart Cache event data.