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Add CoreDNS as an optional addon in kube-up

**What this PR does / why we need it**:
This PR adds the option of installing CoreDNS as an addon instead of kube-dns in kube-up.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #56439 

**Special notes for your reviewer**:

**Release note**:

```release-note
kube-up: Add optional addon CoreDNS. 
Install CoreDNS instead of kube-dns by setting CLUSTER_DNS_CORE_DNS value to 'true'.
```