WHAT

Add quota policy support to the upstream quota plug-in.

WHY

The midstream version of the quota plug-in has a clear separation of concerns between various component for managing quotas and provides a much cleaner API for adding new policies and working with multiple log directories. Having this separation in the upstream quota plug-in will make adding KIP-827 support much cleaner and simpler. This distinction is outlined in Proposal 47.

HOW

This card aims to add an additional `ThrottleFactorPolicy` to apply the throttle when the available percentage of the disk drops below the thereshold.

Specifically this card aims to use the `VolumeSource` and `ThrottleFactorPolicy` introduced by MGDSTRM-10135

Its worth noting the naming of things evolved quite a bit during the proposal process. So the mappings are as follows:

[1] The proposal got rid of the idea of soft limits as being of very limited value and thus the limit policies became much simpler. Without the need for composition. I.e a soft limit based on a percentage and a hard limit based on the absolute values.