add 'list_ingressroute_for_all_namespaces' method

[Priyankasaggu11929]

What type of PR is this?

/kind cleanup
/kind documentation

What this PR does / why we need it:

As mentioned in the linked issue, there is a suggestion to implement a list_ingressroute_for_all_namespaces method, which is meant for listing all the ingressroutes resources across all the namespaces. This PR adds changes to implement the same.

This new method, list_ingressroute_for_all_namespaces is analogous to executing kubectl get ingressroutes --all-namespaces command.

Besides, implementing the above method, the PR also include changes for demonstrating creation & deletion of k8s namespace resources using dynamic client. The methods implemented are create_namespace & deleted_namespace.

Output of the script:

Which issue(s) this PR fixes:

Fixes #1388

Does this PR introduce a user-facing change?

NONE

[yliaog]

namespace_deleted is not used, do you need to assign to it?

[Priyankasaggu11929]

Thank you for pointing. No, the variable namespace_deleted is not required.

I've removed it.

[Priyankasaggu11929]

Thank you for pointing. No, the variable namespace is not required. I've removed it.

[yliaog]

please squash the commits, otherwise looks good.

[Priyankasaggu11929]

Thank you. I've squashed the commits.

[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Priyankasaggu11929, yliaog

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [yliaog]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment