feat: optional disabled by default collector for /proc/vmallocinfo to make bpf jit usage observable

[stevo-f3]

For issues like https://github.com/awslabs/amazon-eks-ami/issues/1219 memory leak to be observable, support alerting, by exposing /proc/vmallocinfo from the node - we need an additional collector.

Current "workaround", of manually running

cat /proc/vmallocinfo | grep bpf_jit | awk '{s+=$2} END {print s}'

is suboptimal in many ways.

[stevo-f3]

@SuperQ WDYT?

[discordianfish]

Seems reasonable. But parsing needs to go into procfs