feat!: a VM's vmid is a string, and its config can describe its hardware

VMDict.vmid and VMConfigDict.vmid were int. Proxmox numbers its guests,
but VMware identifies a VM by UUID, which an int cannot hold. The
provisioning dicts already carried vmid as a string; the read side now
matches. Proxmox reports "100".

VMConfigDict gains optional hardware details -- os_name, cpu_type,
sockets, cores_per_socket, firmware, machine and passthrough (PCI/USB,
as VMPassthroughDict) -- so netOrk's VM hardware view can be filled by
any hypervisor instead of reading Proxmox's raw config through the
driver's private API.

Also fixes the README's hypervisor example, which still named the
pre-contract snapshot_create.

BREAKING CHANGE: VMDict.vmid and VMConfigDict.vmid are str.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "napalm-device-types"
-version = "1.0.0"
+version = "2.0.0"
 description = "Abstract device-type base classes for NAPALM drivers"
 readme = "README.md"
 requires-python = ">=3.10"