raspinfo: Improve display info output

[popcornmix]

Explicitly report kms/fkms/legacy and labwc/wwayfire/Xorg and generally tidy up

report libcamera-hello output if installed

Add sudo to dmesg

[macmpi]

Add sudo to dmesg

Now there are many sudo uses in this script (which gates implicit sudo dependency for downstream packages), how about warning upfront this script should be run with administrator privileges like:
! [ "$(id -u)" -eq 0 ] && { echo >&2 "Please run with administrator privileges."; exit 1; }
or do "escape tests" in various places?

[popcornmix]

Requiring sudo for raspinfo is beyond the scope of this PR.
There will be documentation and guides that will become incorrect after this change.

It's certainly something to consider.

A lighter change would be to only invoke sudo when it is needed (i.e.. raspinfo has not been invoked with sudo).

[macmpi]

How about testing upfront if sudo is available then, and warning/quitting if not?
This would not be disruptive to PiOS users probably.