feat: NAPALM driver for HPE OfficeConnect 1820/1920S

These switches have no CLI at all — no SSH, no Telnet and no ArubaOS-Switch
REST API — so the ProCurve driver cannot serve them despite the shared
vendor. The only management surface is the web UI, which ships its table
data as JavaScript array literals; those parse with ast.literal_eval, so
the driver needs no HTML parser and no dependency beyond napalm/requests.

Read-only by design: the platform exposes a single administrator account
with no privilege levels, and serves HTTPS only after a certificate has
been uploaded, so the polling credential is necessarily the admin
credential over a plain channel.

Implements get_facts, get_interfaces, get_vlans, get_vlans_detail and
get_mac_address_table, plus HTTP/SNMP fingerprints for discovery.

Tested against an HPE OfficeConnect 1820 8G PoE+ (65W), J9982A, PT.02.19.

.gitignore

@@ -0,0 +1,11 @@
+__pycache__/
+*.py[cod]
+*.egg-info/
+build/
+dist/
+.venv/
+venv/
+.pytest_cache/
+.ruff_cache/
+.coverage
+htmlcov/