feat: allow to customize the namespace

[vbehar]

add a new --namespace flag to set a custom namespace - no impact for existing users, because we keep the same default value

[k8s-ci-robot]

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[rjsadow]

/ok-to-test
/cc @reetasingh @rakshitgondwal

[rakshitgondwal]

Please fix the merge conflicts @vbehar

[reetasingh]

nit: would prefer it to be named 'Namespace' since we are utilizing 'namespace' as a variable within the code as well, just to maintain differentiation as a constant value.

[vbehar]

yes I changed it to lowercase to avoid the public visibility, and other packages using it instead of the user-provided namespace. But maybe I can change it to DefaultNamespace to make it clear...

[reetasingh]

yes, that would be good

[vbehar]

ok done

[reetasingh]

/lgtm

[rjsadow]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rjsadow, vbehar

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