VMware Check: Custom Datastore Thresholds and CPU/RAM Monitoring

The VMware check should allow users to set separate warning and critical thresholds for each datastore. This way, a nearly full datastore can have different limits than one that is only partially full; the existing global values remain as the default.

In addition, the check is designed to regularly monitor and display the CPU and RAM utilization of the ESXi hosts. Configurable warning and critical thresholds for these metrics are proposed as an enhancement.