Dist: Add macOS entitlements files for editor code signing

These are the entitlements we define for official macOS editor builds since
Godot 3.3.

Users making custom builds of the engine can use those files with `codesign` to
sign their own builds. E.g.:
```
codesign --force --timestamp \
  --options=runtime --entitlements editor.entitlements \
  -s <your key> -v osx_template.app
```

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