Add more short flags, such as -t for --template

[mboersma]

Frequently-used arguments should have a version that's easier to type. There are probably a few opportunities in the various az capi commands to add these.

[ranakan19]

I believe -t cannot be used for --template, as it is used for --tags. And custom template is the only command which doesn't have a short flag currently.
I'm not sure if any short flag apart from -t makes sense for template. If you agree, then maybe this issue can be closed?

[mboersma]

For az capi create we could perhaps add:

• -c for --node-machine-count (similar to az aks create)
• -p for --pivot
• -x for --external-cloud-provider

For az capi management create:

• -n for --cluster-name (and shouldn't it just be --name for consistency? A separate issue.)

But other than those I don't see anything that looks like it would benefit from a short flag.

@ranakan19 I agree that -t is taken. Do you think the others I listed above are worthwhile?