[AVFoundation] Add AVCaptureDeviceTypeExternal.

[rolfbjarne]

Adds an enum entry for:
https://developer.apple.com/documentation/avfoundation/avcapturedevicetypeexternal

PR originally submitted by @jeremy-visionaid in #21187.

Fixes #21187.

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• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
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• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
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✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. [attempt 2] Html Report (VSDrops) Download
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✅ framework: All 2 tests passed. Html Report (VSDrops) Download
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✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 4 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ linker: All 40 tests passed. Html Report (VSDrops) Download
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✅ monotouch (MacCatalyst): All 7 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 8 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 7 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
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