feat(helm): add extra object option

[haarchri]

Description of your changes

• add extraObjects: [] in helm-chart
  Sometimes, accessory to the installation there may be manifest to be installed (for example ControllerConfig, Providers, PodMonitor ...)

Test

helm list -aA
NAME            NAMESPACE               REVISION        UPDATED                                 STATUS          CHART                   APP VERSION
crossplane      crossplane-system       1               2023-09-22 15:34:37.140885 +0200 CEST   deployed        crossplane-0.0.1        1.13.1     

kubectl get pods -n crossplane-system
NAME                                      READY   STATUS    RESTARTS   AGE
crossplane-5c9d689b67-5rczf               1/1     Running   0          4m15s
crossplane-rbac-manager-6865d6d7f-lqlkm   1/1     Running   0          4m15s

kubectl get controllerconfig
NAME         AGE
aws-config   4m13s

Fixes #

I have:

• Read and followed Crossplane's contribution process.
• Added or updated unit and E2E tests for my change.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR, if necessary.
• Opened a PR updating the docs, if necessary.

[phisco]

I'm not a huge fan of this approach as it feels a bit like scope creep. You should probably wrap this chart in another chart, deploying what you need with all the additional resources, but I understand that's more work. Overall, I don't see any harm in adding this; it's a pretty common pattern.