Add ability to configure bridge interface for access point in Hostapd library

[abeltrano]

Type

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

Side Effects

• Breaking change
• Non-functional change

Goals

• Allow adding access point interfaces to network bridges.

Technical Details

• Extend IHostapd::SetNetworkBridge with function to set network bridge interface.
• Add Hostapd::SetNetworkBridge implementation.
• Add unit test for IHostapd::SetNetworkBridge.

Test Results

• All unit tests pass.

Reviewer Focus

• None

Future Work

• Expose this functionality into type-neutral layer (Microsoft::Net::Wifi::AccessPoint*).
• Expose this functionality into top-level API.

Checklist

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