Implement netremote type for rfattenuator tool

[wptestyyh]

Type

• Bug fix
• Feature addition
• Feature update
• Documentation
• Build Infrastructure

Side Effects

• Breaking change
• Non-functional change

Goals

• Enable rfattenuator tool to control attenuator by netremote server
• Add get and set commands

Technical Details

Test Results

• ./rfattenuator-cli netremote 192.168.3.20 5047 set 1 100
  Creating netremote attenuator client @ 192.168.3.20:5047 ... succeeded
  Setting attenuation for channel 1 to 100 dBm: succeeded
• ./rfattenuator-cli netremote 192.168.3.20 5047 get 1
  Creating netremote attenuator client @ 192.168.3.20:5047 ... succeeded
  Attenuation for channel 1: 100 dBm

Reviewer Focus

Future Work

Checklist

• Build target all compiles cleanly.
• clang-format and clang-tidy deltas produced no new output.
• Newly added functions include doxygen-style comment block.