AuthPolicy: Add status block

[rahulanand16nov]

155

This PR:

• Makes AuthSchemes singular so that only one AuthScheme is allowed hence AuthConfig.
• Adds status block to the AuthPolicy CRD.
• Updates AuthPolicy doc to be updated with the recent changes.

  status:
    conditions:
    - lastTransitionTime: "2022-06-29T12:23:14Z"
      message: HTTPRoute is protected
      reason: HTTPRouteProtected
      status: "True"
      type: Available
    observedGeneration: 1

  status:
    conditions:
    - lastTransitionTime: "2022-06-29T12:23:14Z"
      message: Gateway is protected
      reason: GatewayProtected
      status: "True"
      type: Available
    observedGeneration: 1

Note: If for some reason, AuthConfig is not ready when AuthPolicy is reconciling, it will say AuthConfigNotReady, but the status update will only happen in the next reconciliation event because IIRC, we cannot watch the status block of a resource (correct if I am wrong here).

[maleck13]

Are we consistent with the RLP? I am assuming yes but wanted to check that the user experience is at least similar from a status point of view for both

[rahulanand16nov]

Are we consistent with the RLP? I am assuming yes but wanted to check that the user experience is at least similar from a status point of view for both

Yes, as of now.

[eguzki]

is README.md doc up to date regarding auth?

[rahulanand16nov]

is README.md doc up to date regarding auth?

Docs update coming in next PR :)