RFE: Add environment variables for the calling user's group name, GID, and supplementary group names/IDs

[Melab]

$SUDO_UID contains the UID of the process that called sudo , $SUDO_GID contains the GID, and $SUDO_USER contains the username. To fully complement these, sudo should also set environment variables containing:

• The group name corresponding to the GID that a process calls sudo with.
• The supplementary GIDs of the calling process.
• The group names corresponding to the supplementary GIDs.