Add AKS addon support

[vivgoyal]

/kind feature

Describe the solution you'd like
Add support for installing/managing AKS addons as part of the control plane reconciliation.

[devigned]

Azure API for addons: https://docs.microsoft.com/en-us/rest/api/aks/managedclusters/createorupdate#managedclusteraddonprofile

[CecileRobertMichon]

/help

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[surajrana93]

@CecileRobertMichon
Can I help here?

[CecileRobertMichon]

@surajrana93 go for it. Let me or @alexeldeib know if you have any qestions.

/assign @surajrana93

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Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

[CecileRobertMichon]

/remove-lifecycle stale
/unassign @surajrana93

[alexeldeib]

/remove-lifecycle stale

Required work:

• Add a field to AzureManagedControlPlane with a map/slice of addon configurations
• Update AzureManagedControlPlane reconciler to pass those fields to managedclusters service/client.
• Update managedclusters service/client to consume those fields and pass them to AKS
• Webhook validation on addon options? I'm not sure if there are any other restrictions like e.g. incompatible addons, addons you can't disable, etc. that's a TODO if you want to work on this :)

addons are surprisingly poorly documented via anything other than the CLI: https://docs.microsoft.com/en-us/cli/azure/aks?view=azure-cli-latest#az_aks_enable_addons

The code is simple enough: https://github.com/Azure/azure-cli-extensions/blob/fa207098b7bbe12c8e074b81e7fe55d6e028d49c/src/aks-preview/azext_aks_preview/_consts.py#L68-L79

Here's an example of how it looks in the REST API. The addon names are well-known (see the CLI link), and as far as I know there is no dynamic way to list those (they don't change too often).

It ends up here in the Go SDK.

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/lifecycle stale

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/lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue.

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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[michalno1]

/reopen

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[zmalik]

/reopen

[k8s-ci-robot]

@zmalik: Reopened this issue.

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/reopen

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[zmalik]

/assign michalno1

[CecileRobertMichon]

/remove-lifecycle rotten
/lifecycle active