What can happen, if I decide to install the following suggested packages:
linux-headers-4.15.0-112-generic, linux-hwe-tools, fdutils ??

Nothing but a small loss of disk space: if you do not know what an uninstalled package is for, then you usually have no use for it.

what is the package "thermald"

Its description says "Thermal monitoring and controlling daemon".

For details: https://01.org/linux-thermal-daemon/documentation/introduction-thermal-daemon

does "hwe" stand for hardware enablement?

It does.

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