Encode H.264 with our own VideoToolbox session: AutoLevel, no rate freeze, High for Chrome

[MarshalX]

• Replace the SDK's VideoToolbox H.264 encoder with our own; the SDK decoder stays
• Fix 1080p/4K sending nothing: use AutoLevel instead of the SDP's level 3.1
• Fix bitrate stuck at ~600 kbps: drop DataRateLimits, which freezes later bitrate increases
• Offer High (64001f) for Chrome, which lacks Constrained High
• 720p/1080p/4K now reach 2.5/5.0/15.6 Mbps; Chrome decodes our 1080p
• Add a macOS test that 1080p H.264 gets encoded

[read-the-docs-community]

Documentation build overview

📚 wrtc | 🛠️ Build #35076426 | 📁 Comparing ae3c42a against latest (c6e84b6)

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