[ADD] macos rename computer script

[jpros]

Added script to rename macos computer. Already tested in a MacBook Pro m1 running macOS Monterey.

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[bbrendon]

Why wasn't scutil --set HostName included?

[jpros]

@bbrendon, I used the "set HostName". After further research, the LocalHostName works fine for ".local" hostnames, so I removed the "set HostName".

The "set HostName" option is only useful when you have an FQDN associated with the machine, and in my POV, that's not a common use case for Macs.

We could create another script for those who want to have an FQDN associated, but in the scenario of my company, we wouldn't use that.

[silversword411]

Why not one script, with a switch to choose which method?