Support intstr.IntOrString type in cmd

[peaaceChoi]

When using the edit instancegroup with --set option , a parsing error occurs if it is not a primitive type. The instance group struct has a custom type, and supporting it makes using cmd more comfortable.

e.g)
When trying to updatespec.rollingUpdate.maxUnavailable with edit instancegroup, a type error occurs because maxUnavailable is of type intstr.IntOrString.

./kops edit instancegroup --set 'spec.rollingUpdate.maxUnavailable=100%'
=> Unhandled type...

This PR supports processing the intstr.IntOrString type.

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[k8s-ci-robot]

Hi @peaaceChoi. Thanks for your PR.

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[hakman]

/ok-to-test

[hakman]

Interesting approach. Thanks for the PR @peaaceChoi.
/lgtm
/cc @justinsb

[hakman]

/lgtm

[justinsb]

Thanks @peaaceChoi - we discussed in office hours and it looks good!

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb

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[hakman]

/retest