*sparkles* Cluster Resource Set

[detiber]

What this PR does / why we need it:

• Adds a cluster template that uses ClusterResourceSet for CNI deployment
• Adds some defaults

To test this out, you will need to:

• Set EXP_CLUSTER_RESOURCE_SET=true when running clusterctl init
• Use --from to point to the template when running clusterctl config, if the cluster-template-crs.yaml file was attached to a release, then it would be possible to use --flavor=crs rather than --from

The template can be tested with the currently released images

[detiber]

/assign @rawkode

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/assign @rawkode

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: detiber, rawkode

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[gianarb]

/lgtm