Add Aruba AOS-CX to the Netmiko and Hier Config library mappers

[dspatig-gdx]

Environment

• netutils version: 1.17.4 (develop)

Proposed Functionality

Add aruba_aoscx to the Netmiko and Hier Config library mappers in
netutils/lib_mapper.py:

• NETMIKO_LIB_MAPPER["aruba_aoscx"] = "aruba_aoscx" — netmiko already ships an
  aruba_aoscx device type (HPEArubaCXSSH), but netutils had no entry, so
  NAME_TO_ALL_LIB_MAPPER["aruba_aoscx"] was missing its netmiko key. The reverse
  mapper is derived from the forward map, so this one line also produces
  NETMIKO_LIB_MAPPER_REVERSE["aruba_aoscx"].
• HIERCONFIG_LIB_MAPPER["aruba_aoscx"] = "aruba_aoscx" (and reverse) — hier_config's
  HConfig now ships an Aruba AOS-CX platform (Platform.ARUBA_AOSCX, keyed by the
  string "aruba_aoscx"). Its v2→v3 resolver reads network_driver_mappings["hier_config"]
  from netutils; without this entry, AOS-CX falls back to the GENERIC driver.

Use Case

Lets Netmiko-based tooling and hier_config / nautobot-golden-config resolve Aruba
AOS-CX through the standard netutils driver-name mapping, consistent with how
aruba_aoscx is already normalized across the scrapli, ntc_templates,
forward_networks, and netutils_parser mappers.