✨ Replace flag with pflag

[aniruddha2000]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #106

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squash commits
• include documentation
• add unit tests

[janiskemper]

do we need to add pflag.CommandLine.AddGoFlagSet(flag.CommandLine) before parsing? I'm not sure...

[kranurag7]

do we need to add pflag.CommandLine.AddGoFlagSet(flag.CommandLine) before parsing? I'm not sure...

Building the executable locally and invoking the same -h is working fine. I haven't tested the same on the tilt setup. @aniruddha2000 please test if you have a running tilt setup.

[aniruddha2000]

Well, I don't have any access to Hivelocity UI to see if devices are there or not, but I can clearly see that I have providerID in my k9s after creating a cluster by tilt, does that work?

[janiskemper]

I think this is more a question of how flags work, not whether the operator works as a whole. But I guess you can proceed
EDIT: I think it doesn't harm to add it and we should do that in order to prevent issues in the future