feat: NAPALM drivers for VMware ESXi and vCenter

Two drivers from one package, both in the hypervisor role:

- vmware_esxi talks to one host directly: facts, vmnics and vmkernel
  NICs, CDP/LLDP neighbours, sensors, VMs, datastores and port groups.
- vmware_vcenter talks to a vCenter: every VM of every host it manages,
  with the host as the VM's node, plus distributed port groups. It
  reports no interfaces of its own; the hosts' NICs belong to the hosts.

Both implement the HypervisorDriver VM contract: get_vms, get_vm_config,
start/stop/reboot/suspend_vm and the four snapshot methods, and emit raw
device warnings (maintenance mode, disconnected host, config issues,
host managed by a vCenter, free license making the API read-only).

Every read is a PropertyCollector query for the explicit paths in
paths.py, converted by to_plain() into dicts and lists; the parsers
only ever see that. tools/harvest.py dumps exactly those paths to JSON
and tools/sanitize.py scrubs the dump, so a real host can become a test
fixture without code changes. A VM's vmid is its instance UUID, which
survives vMotion and re-registration; a MoRef does not.

Tested against govmomi's vcsim in ESXi and vCenter mode, including real
power and snapshot tasks. Not yet tested against real hardware.

napalm_vmware/parse/storage.py

@@ -0,0 +1,27 @@
+"""``get_vm_storage_pools``: datastores."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from napalm_device_types.models import StorageVolumeDict
+
+
+def storage_pools(datastores: list[dict[str, Any]]) -> dict[str, StorageVolumeDict]:
+    """Datastores keyed by name. ``enabled`` means currently accessible."""
+    result: dict[str, StorageVolumeDict] = {}
+    for ds in datastores:
+        summary = ds.get("summary") or {}
+        name = ds.get("name") or summary.get("name", ds["_moref"])
+        total = int(summary.get("capacity") or 0)
+        free = int(summary.get("freeSpace") or 0)
+        result[name] = {
+            "name": name,
+            "type": str(summary.get("type", "")).lower(),
+            "total": total,
+            "used": total - free,
+            "available": free,
+            "enabled": bool(summary.get("accessible", False)),
+            "shared": bool(summary.get("multipleHostAccess", False)),
+        }
+    return result