Allow customizing the parameters in the kube_reserve_memory() function

**What I'd like:**

We have a tendency to over-subscribe our nodes ... allowing pods to have higher `limits.memory` settings than their `requests.memory`. We expect/hope that processes inside containers will be OOMKilled before critical system processes (like `kubelet`) are ... but our experience is showing that `kubelet` often gets OOMKill events first.

I know that we can _hard code_ a new memory reservation for the kubelet process.. but what I really want is to be able to alter the parameters that go into the https://github.com/bottlerocket-os/bottlerocket/blob/a63007cfbd44beea85596fe7f8eac98643cd3d7d/sources/api/schnauzer/src/helpers.rs#L1079-L1081 function.

I would like parameters that allow us to change the `11` and `255` numbers, while retaining the general dynamic calculation. That would allow us to tweak these numbers to fit our environment, without losing the dynamic nature of the configuration.

**Any alternatives you've considered:**

I have considered trying to do this in a bootstrap container... I just hate to do all that work when I think a few parameters could be added in here and this could then be easy.