chore: adopt the NAPALM driver standard

- CI moves to .gitea/workflows/ci.yml and calls the shared driver workflow
  of NAPALM/driver-standard; .github/ is gone.
- setuptools>=77 with the SPDX license string, no License classifier,
  Python 3.13 classifier, napalm-device-types>=4.21.1, a dev extra with
  floors, Issues and Changelog links; README installs from PyPI and links
  pyVmomi on PyPI.
- mypy strict for the package (the blanket ignore_missing_imports is now
  limited to napalm and yaml); exempt for now (35 errors): _inventory,
  _session, _tasks, base, esxi, parse.environment, parse.snapshots,
  parse.vm_devices, provision.seed, provision.transfer, provisioning.
  Recorded in the quality baseline with the long and complex functions.
- Coverage floor 97 % (measured 97.11 %).

tests/quality_baseline.json

@@ -0,0 +1,31 @@
+{
+ "coverage_floor": 97.0,
+ "function_complexity": {
+  "napalm_vmware/_plain.py::to_plain": 11,
+  "napalm_vmware/base.py::VmwareBaseDriver._find_vm": 12,
+  "napalm_vmware/parse/facts.py::host_serial": 11,
+  "napalm_vmware/parse/interfaces.py::host_interfaces": 11,
+  "napalm_vmware/parse/vms.py::_vm": 13,
+  "napalm_vmware/provision/placement.py::choose_placement": 16
+ },
+ "function_lines": {
+  "napalm_vmware/provision/ovf.py::ovf_descriptor": 80,
+  "napalm_vmware/provisioning.py::VmwareProvisioningMixin._import_ovf": 56,
+  "napalm_vmware/provisioning.py::VmwareProvisioningMixin.create_vm_from_cloud_init": 57
+ },
+ "mypy_relaxed": [
+  "napalm_vmware._inventory",
+  "napalm_vmware._session",
+  "napalm_vmware._tasks",
+  "napalm_vmware.base",
+  "napalm_vmware.esxi",
+  "napalm_vmware.parse.environment",
+  "napalm_vmware.parse.snapshots",
+  "napalm_vmware.parse.vm_devices",
+  "napalm_vmware.provision.seed",
+  "napalm_vmware.provision.transfer",
+  "napalm_vmware.provisioning"
+ ],
+ "python_file_lines": {},
+ "untyped_public": []
+}