fix: add namespace autocompletion for kubectl config set-context command

[TessaIO]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR aims to add the namespace autocompletion for kubectl config set-context command

Which issue(s) this PR fixes:

Fixes kubernetes/kubectl#1564

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Added namespace autocompletion for kubectl config set-context command

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

N/A

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: TessaIO
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[TessaIO]

@ah8ad3 wanna take a look at this?