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.
- requires-python >=3.10 (napalm-device-types needs it), napalm-device-types
  >=4.21.1, LICENSE file, py.typed, SPDX license string, a dev extra with
  floors, links to git.netork.io (README included), CHANGELOG.md.
- mypy strict for the package; exempt for now, with 130 errors between
  them: napalm_openwrt.config_mixin, .interfaces_mixin, .lldp_mixin,
  .openwrt, .packages_mixin, .routing_mixin, .system_mixin, .vlan_mixin and
  .wireless_mixin. They are recorded in the quality baseline with the long
  and complex functions and the one unannotated public method.
- Coverage floor 65 % (measured 65.03 %).

.gitea/workflows/ci.yml

@@ -0,0 +1,15 @@
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+    tags: ["v*"]
+  pull_request:
+
+jobs:
+  driver:
+    uses: NAPALM/driver-standard/.gitea/workflows/driver.yml@main
+    with:
+      standard-ref: main
+    secrets:
+      PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}