Custom form views for Creating/Updating GatewaysClass

[R-Lawton]

WHAT

Like what we did in Kuadrant for DNS Policy, TLS Policy etc. Create a custom form view to enhance the current create/update flow for gatewayClasses.

Both create and update views should :

• Have data synchronisation between both the form view and the YAML view. i.e if the user toggles between them both the information is consistent and no information is lost.
• Prohibit creating or saving the form if certain necessary information is missing.
• Grey out certain input boxes if information can not be changed with a update

Example:
https://github.com/Kuadrant/kuadrant-console-plugin/blob/main/src/components/KuadrantDNSPolicyCreatePage.tsx