feat: COSI controller Addon

[dkoshkin]

What problem does this PR solve?:
This PR adds the COSI controller Addon, without any providers.
The chart comes from https://github.com/mesosphere/charts/tree/master/stable/cosi

The addon does not take in any configuration so the API to enable it is just:

apiVersion: cluster.x-k8s.io/v1beta1
kind: Cluster
metadata:
  name: <NAME>
spec:
  topology:
    variables:
      - name: clusterConfig
        value:
          addons:
            cosi: {}

Once we add providers, the API can be similar to what it is with CSI with a providers: field.

Which issue(s) this PR fixes:
Fixes #

How Has This Been Tested?:

New unit tests.
Also deployed it on a Nutanix Cluster and the Nutanix COSI driver from nutanix-cloud-native/cosi-driver-nutanix#375

Create the credentials Secret

apiVersion: v1
kind: Secret
metadata:
  annotations:
  labels:
  name: objectstorage-provisioner
  namespace: cosi-driver-nutanix
stringData:
  ACCESS_KEY: "<>"
  ACCOUNT_NAME: "<>"
  ENDPOINT: "http://10.1.1.1:80"
  PC_SECRET: "<>:9440:<>:<>"
  SECRET_KEY: "<>"
type: Opaque

NUTANIX_COSI_DIR=<>
helm install cosi-driver -n cosi-driver-nutanix --create-namespace --set=secret.enabled=false --set=cosiController.enabled=false --skip-crds$NUTANIX_COSI_DIR/charts/

kubectl apply -f $NUTANIX_COSI_DIR/project/examples/bucketclass.yaml
kubectl apply -f $NUTANIX_COSI_DIR/project/examples/bucketclaim.yaml
kubectl apply -f $NUTANIX_COSI_DIR/project/examples/bucketaccessclass.yaml
kubectl apply -f $NUTANIX_COSI_DIR/project/examples/bucketaccess.yaml

# From https://github.com/nutanix-cloud-native/cosi-driver-nutanix/pull/374
kubectl apply -f https://raw.githubusercontent.com/nutanix-cloud-native/cosi-driver-nutanix/944ce9ba66bc34e59bd94519a88da8bf9fae3d0c/project/examples/awscliapppod.yaml

The Secret was correctly generated and the test Pod wrote and read to a new bucket.

$ kubectl logs awscli
Defaulted container "awscli" out of: awscli, write-aws-credentials (init), write-test-file (init)
+ aws s3 ls
2025-01-07 20:43:31 sample-bucketclass8ce19295-f704-45bb-a533-15591c55a747
++ cat /tmp/test-directory/file.txt
+ readonly BUCKET_NAME=sample-bucketclass8ce19295-f704-45bb-a533-15591c55a747
+ BUCKET_NAME=sample-bucketclass8ce19295-f704-45bb-a533-15591c55a747
++ date +%Y%m%d_%H%M%S
+ readonly FILE_NAME=20250107_205233.txt
+ FILE_NAME=20250107_205233.txt
+ aws s3 cp /tmp/test-directory/file.txt s3://sample-bucketclass8ce19295-f704-45bb-a533-15591c55a747/20250107_205233.txt
upload: ../tmp/test-directory/file.txt to s3://sample-bucketclass8ce19295-f704-45bb-a533-15591c55a747/20250107_205233.txt
+ aws s3 cp s3://sample-bucketclass8ce19295-f704-45bb-a533-15591c55a747/20250107_205233.txt -
sample-bucketclass8ce19295-f704-45bb-a533-15591c55a747

Special notes for your reviewer: