Add Status field to OnePasswordItem resource

[jpcoenen]

This makes it easier to see whehter the controller succeeded in creating the Kubernetes secret for a OnePasswordItem. A user or tool can just look at the status field to see whether the Kubernetes secret has successfully been created. If something went wrong, you can just inspect the status field to see the related error. This instead of having to dig into the logs.

Examples

Success example:

apiVersion: onepassword.com/v1
kind: OnePasswordItem
metadata:
   [...]
spec:
  itemPath: vaults/jcg4jdrrp5g6spaqwzpxojmr4i/items/wdqh5wf5ez4mgubnsobs67urzy
status:
  conditions:
    - status: 'True'
      type: Ready
  ready: true

Error example:

apiVersion: onepassword.com/v1
kind: OnePasswordItem
metadata:
   [...]
spec:
  itemPath: vaults/jcg4jdrrp5g6spaqwzpxojmr4i/items/this-does-not-exist
status:
  conditions:
    - message: >-
        Failed to retrieve item: No items found with identifier
        "this-does-not-exist"
      status: 'False'
      type: Ready
  ready: false

References

The topic of status/condition is somewhat confusing and there are many ways to do things. Here are some references I used:

• https://docs-nine-inky.vercel.app/blog/track-state-in-your-kubernetes-operator
• https://maelvls.dev/kubernetes-conditions/

Closes #52