Initial commit for collection of must-gather

[shivprakashmuley]

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✨ Finishing touches

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[Prashanth684]

@shivprakashmuley while this is a good start - we might want to think about having more must gather tools tailored to generating a plan with different options specified through oc here. Some of the tools that come to mind:

• must-gather-plan-with-since-time
• must-gather-plan-with-image
• must-gather-plan-with-all-images
• must-gather-plan-with-namespace
• must-gather-plan-with-host-network

[Prashanth684]

as we write different tools with more options, it will increase complexity - so it would be good to have a utility file with functions specific to generating the pod spec

[Prashanth684]

while it is nice to provide a plan with a pod spec, I think we should also have tools provide the oc adm must-gather equivalent command in case users are just looking to collect through oc

[Prashanth684]

are we assuming that such an SA and namespace exist? can't we create an ephemeral namespace and use the default SA?