feat: Tweak kernel parameters

[hazzuk]

Prerequisites

• I have searched existing and closed feature requests

Proposal

The Linux kernel has parameters that can be tweaked to better suit a systems needs. We should investigate if there are any parameters we should adjust for a server use case.

Motivation

The karo-stack already adjusts two kernel parameters. One for UDP buffer sizes and another with IPv4 packet forwarding (see roles/karo-system/files/sysctl_karo.conf). It's safe to assume there might be further tweaks that could be made.

Context

https://wiki.archlinux.org/title/Sysctl