Add structured logging infrastructure using Microsoft.Extensions.Logging #56

Summary

Introduce logging infrastructure in WebRtcNet/WebRtcInterop based on Microsoft logging extensions so failures and diagnostic events can be surfaced consistently.

Motivation

We need first-class logging support before continuing media/interop hardening work. As an immediate example, audio device enumeration paths currently avoid surfacing diagnostics and should eventually emit useful logs.

Scope

• Add project-level logging infrastructure aligned with modern .NET Core logging patterns.
• Establish a consistent logging approach that can be used across managed and interop-facing code paths.

Out of scope

• Detailed implementation design and wiring specifics.
• Refactoring all existing code paths in this issue.

Acceptance criteria

• A clear logging infrastructure baseline exists and is ready for incremental adoption in follow-up issues.