INode.HasChildNodes is now exposed as a method to DOM

[arekdygas]

Types of Changes

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• Bug fix (non-breaking change which fixes an issue, please reference the issue id)
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Description

Fixes AngleSharp/AngleSharp#1219

Handling of new Accessors.Method member added, which was required to correctly expose the property.

Current pull request is only a part of the fix. First part: AngleSharp/AngleSharp#1224

Warning

Code in this fix won't compile until the current project references AngleSharp version with Accessors.Method implemented.