Feat(eos_cli_config_gen): Add support for MACsec fallback to unprotected traffic

[Shivani-gslab]

Change Summary

Add support for MACsec fallback to unprotected traffic.

Related Issue(s)

Fixes #3696

Component(s) name

arista.avd.eos_cli_config_gen

Proposed changes

Adding traffic_unprotected to mac_security data-model-

mac_security:
       traffic_unprotected:

            # Allow/drop the transmit/receive of unprotected traffic.
            action: <str; "allow" | "drop"; required>

            # Allow transmit/receive of encrypted traffic using operational SAK and block otherwise.
            allow_active_sak: <bool>

How to test

Molecule test and test on EOS.

Checklist

PR Checklist

• [x] Check the command ordering on EOS.

Repository Checklist

• [x] My code has been rebased from devel before I start
• [x] I have read the CONTRIBUTING document.
• [x] My change requires a change to the documentation and documentation have been updated accordingly.
• [x] I have updated molecule CI testing accordingly. (check the box if not applicable)