Add the ability to set friendly name when using `step certificate p12`

[aae42]

Hello!

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Issue details

Provide the ability to override the friendly name when using step certificate p12.

Why is this needed?

Sometimes we get specific requests for friendly names in pfx packages. With openssl pkcs12 we can provide the --name parameter. I can only assume these friendly names are used as part of some other process where having the default of <subject> - <fingerprint> is unacceptable.

[aae42]

don't do a ton of Go and have never contributed here, but made a start w/ this commit, still need to go through the rest of the contribution guidelines...

[hslatman]

Hi @aae42, sounds like a useful thing to have and good to see you're already working on it. Let us know when we can review or help otherwise 🙂