boundary connect kube helm style

[mushrushu]

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Is your feature request related to a problem? Please describe.

Hello folks!

I think that helm is one of the most utilized binary with regard to kubernetes manipulation, so it would be useful to support it as a style for boundary connect kube command.

Describe the solution you'd like

It looked like easy enough fix for me, so I've implemented it in my repo by adding an extra case statement and specifying arguments valid for the helm binary.

I can go ahead and make a pull request if you think it's good enough.

[xingluw]

Hi @mushrushu, right now we aren't allowing any third-party subcommands contributions to our main code, but we may support this in the future as a custom plugin, allowing anyone to add their own subcommands to Boundary.