Integrate awesome-prometheus-alerts vault checks

[cfi2017]

I propose to integrate the monitoring rules at https://samber.github.io/awesome-prometheus-alerts/rules#hashicorp-vault-1
into our Vault monitoring chart.

There are some checks we do not currently do with our chart.
Ideally, I'd like to point to a reference of the upstream so we don't have to maintain a carbon-copy of the monitoring rules ourselves.

Affected chart
vault-monitoring