Adds roles xcode_offline and brew to Unix_Playbook

[mahdipub]

The new Xcode_offline role will install xcode from an offline copy in /files dire. The brew role also will install brew on macos. Both rely on installing python on mac machine in advance.

Checklist

• commit message has one of the standard prefixes

[mahdipub]

Mac do not let any Ansible activity before you install python manually. So you need to do a workaround before running this PB.
1- download python from https://www.python.org/ftp/python/3.11.4/python-3.11.4-macos11.pkg
2- scp downloaded file to macos (example: scp ~ /Downloads/python-3.11.4-macos11.pkg adminuser@macXXXXXX.rtp.raleigh.ibm.com: ~/)
3- ssh to mac machine and run this to install python:
sudo installer -pkg ~/python-3.11.4-macos11.pkg -target /Applications && /Applications/Python\ 3.11/Install\ Certificates.command && /Applications/Python\ 3.11/Update\ Shell\ Profile.command

4- then we can start using the PB as normal.

So brew can be added as a role and let Ansible install it for us.

[karianna]

@mahdipub Can you fix the linter issues please

[mahdipub]

@mahdipub Can you fix the linter issues please

Based on comments on slack, I will close this PR and split changes in 2~3 PRs. The one related to Xcode-offline and the other for brew is #3417.