Fix JsonEx::Merge to handle chunked properties

[ortogonal]

This fix makes JsonEx::Merge aware of chunked properties and make sure the merged result cleans up "left over" checked properties.

createOptions is one of these chunked properties that needs special handling when merging. If merging a JSON-object that contains createOptions and createOptions01 with a JSON-object that ONLY contains createOptions the original implementation of Merge(...) will keep createOptions01 the the base JSON-object. From a JSON perspective this is correct but from a JSON-object which the chunked property createOptions this is wrong.

The pull-request contains added test-cases for JsonEx::Merge that shows how it handled chunked properties, for example createOptions.

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[ortogonal]

@microsoft-github-policy-service agree

[vadim-kovalyov]

Thank you for the contribution, @ortogonal. We are reviewing the PR and will get back to your shortly.