iOS/macOS: add ability to set entitlements

[tido64]

Proposal

Entitlements grant the app particular capabilities.

We added support for pointing to another .entitlements file in 0.9.7. However, it would be nice if entitlements can be declared directly in app.json:

{
  "macos": {
    "codeSignEntitlements": {
      "com.apple.security.app-sandbox": true,
      "com.apple.security.files.user-selected.read-only": true,
      "com.apple.security.network.client": true
    }
  }
}

Alternatives

n/a

Implementation Details

We can generate an .entitlements file like we do for Assets.xcassets and Info.plist:

react-native-test-app/ios/test_app.rb

Lines 257 to 258 in a9ff329

	generate_assets_catalog!(project_root, target_platform, destination)
	generate_info_plist!(project_root, target_platform, destination)

Additional Context

No response

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