Implement AeroflexWeinschle83XX attenuator library

[wptestyyh]

Type

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

Side Effects

• Breaking change
• Non-functional change

Goals

• Enable controlling AeroflexWeinschle83XX by socket

Technical Details

• Add RfAttenuatorAeroflexWeinschle83XXFactory to create AeroflexWeinschle83XX attenuator controller
• Add RfAttenuatorTransportSocketLinux to communicate with attenuator by socket
• Add SocketHelpers to connect, send and receive data to/from the attenuator
• Add some utility classs

Test Results

• A test tool will be added and run latter in next PR

Reviewer Focus

• None

Future Work

• A test tool calls those API exposed by this library to control AeroflexWeinschle83XX attenuator
• Need move /home/test/netremote/src/common/rfattenuator out of common folder to /home/test/netremote/src/linux, and change the grpc service code to use rfattenuator interface instead of directly create its instance in the grpc service. So, the common folder can still be platform independent and can build on both linux and windows

Checklist

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