Allow specifying JSON configuration to netremote-server on command-line

[abeltrano]

Type

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

Side Effects

• Breaking change
• Non-functional change

Goals

• Allow specifying fixed/static configuration via a JSON file.
• Allow associating RF attenuator channel configuration with access points and make such information available at runtime.

Technical Details

• Expose ability to look up AccessPointAttributes from AccessPointManager.
• Consolidate IAccessPointFactory::Create() functions into one.
• Pass AccessPointAttributes from IAccessPointCreateArgs to concrete IAccessPoint constructor upon creation.
• Add string <-> string property map to AccessPointAttributes to allow association of unstructured data to access point.
• Add helper to parse JSON configuration file contents (NetRemoteServerJsonConfiguration).
• Add netremote-server CLI flag -c (--config, etc.) to specify optional JSON configuration file location.
• Expand NetRemoteServerConfiguration with access point attributes parsed from JSON configuration file, if specified.
• Extend AccessPointDiscoveryAgentOperationsNetlink to accept function to look up access point attributes, and if available, pass them to the IAccessPointFactory instance so they are forwarded to the created IAccessPoint insteance.
• Add related unit tests.
• Fix a few typos in code surrounding that which was modified.

Test Results

• All unit tests pass on both Windows and Linux.

Reviewer Focus

• None

Future Work

• None

Checklist

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