Add SAP diagnostics agent installation option

[arbulu89]

The SAP diagnostics agent is a commonly used tool in all SAP deployments. It is installed in every host which has some SAP software running, and used to diagnose the execution.

It would be a good to have thing in the deployment.
The installation is pretty straightforward:
https://help.sap.com/viewer/lama_help/4d975fc8202c4550b2531661fbc3cf44.html

It only requires to have the installation software in some media, and running sapinst with some predefined variables.
Obviously it requires more research, but I could try to provide you more information if somebody takes this task.

[picoroma]

have a look to this installation approach (Unattended) - Used for SAP DAA Mass Deployment:
https://blogs.sap.com/2017/08/02/diagnostic-agent-mass-deployment/

[yeoldegrove]

Seems that it also could get tricky according to this:
https://blogs.sap.com/2022/01/27/another-mystery-solved-connect-diagnostic-agent-propery/

Let me do some research.