[camera] Support scanning barcode from URL

[alanjhughes]

Why

Now that expo-barcode-scanner is deprecated, users have been asking for a replacement for BarcodeScanner.scanFromURLAsync. This PR adds that feature to camera.

How

Added Camera.scanFromURLAsync

Test Plan

Added a new screen to NCL to test

iOS	Android

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: b92f823

Fingerprint diff

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    "type": "dir",
    "filePath": "../../packages/expo-camera/android",
    "reasons": [
      "expoAutolinkingAndroid"
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    "hash": "eae12ca618c9f0afc94f02ea5ce70706337f5f09"
  },
  {
    "type": "dir",
    "filePath": "../../packages/expo-camera/ios",
    "reasons": [
      "expoAutolinkingIos"
    ],
    "hash": "dc0bfcd987fa60785614c4743cc9ce7f00d497e5"
  }
]

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