Add paloalto_panos show lldp neighbors all

[julmanglano]

ISSUE TYPE

• New Template Pull Request

COMPONENT

paloalto_panos_show_lldp_neighbors_all

SUMMARY

New template for show lldp neighbors all on PAN-OS firewalls. 18 captured fields covering both local-side and neighbor-side LLDP TLVs.

Cross-vendor field naming — aligned with docs/dev/data_model.md and sibling LLDP-detail templates (cisco_ios, cisco_nxos, hp_procurve, aruba_aoscx):

• LOCAL_INTERFACE, NEIGHBOR_NAME, NEIGHBOR_INTERFACE, NEIGHBOR_INTERFACE_DESCRIPTION, NEIGHBOR_DESCRIPTION, CHASSIS_ID, MGMT_ADDRESS, CAPABILITIES, CAPABILITIES_SUPPORTED
• PAN-OS-specific fields (no cross-vendor analog): INDEX, LOCAL_PORT_ID, NEIGHBOR_CHASSIS_TYPE, PORT_TYPE, TTL, MGMT_ADDRESS_TYPE, INTERFACE_NUMBER, INTERFACE_TYPE, OID

Multi-line System Description handling — HPE Comware platforms emit a 3-line System description (model line + copyright). Handled via a dedicated SysDescr state, scoped so the continuation-swallow doesn't bleed into the Start state. Exit signal is System capabilities: which carries no data, so no information is lost. Only the first (model+version) line is captured — matches the convention in sibling LLDP-detail templates that don't multi-line-capture either.

Fixtures (two):

• paloalto_panos_show_lldp_neighbors_all.raw — standard mix. Aruba CX neighbors with mgmt block, HP 2930M with Locally assigned port type and empty oid, PAN-OS firewall neighbor without mgmt block, and an empty-fields record (peer not advertising Port description / System name / System description / capabilities).
• paloalto_panos_show_lldp_neighbors_all2.raw — exercises the Comware multi-line description path (HPE 10504), plus quoted port descriptions ("UPLINK_TO_FIREWALL-2") and HP J9726A Locally assigned rows.

Other notes:

• Required LOCAL_INTERFACE gates empty leading-record emission (standard pattern in sibling templates).
• Trailing commas in capabilities (Supported: O, P, B, R,) preserved as-is in capture.
• Index entry added in length-sorted + alphabetical order (length 31 — between show_interface_hardware and show_running_nat-policy).

Test output

```
$ poetry run pytest tests/test_structured_data_against_parsed_reference_files.py -k "paloalto_panos/show_lldp_neighbors_all" tests/test_capture_group.py tests/test_index_order.py tests/test_testcases_exists.py
...
====================== 3 passed, 4798 deselected in 0.57s ======================

$ poetry run pytest tests/test_capture_group.py tests/test_index_order.py tests/test_testcases_exists.py
...
============================= 2923 passed in 3.05s =============================
```