Add tests for DataContractSerializer serializing System.Globalization types

[huanwu]

We need have tests covering DataContractSerializer serializing the following types.
Refer https://github.com/dotnet/corefx/blob/master/src/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs on how to add the DCS tests using the common helper method.
#21982

• System.Globalization.CompareInfo
• System.Globalization.SortVersion

[tarekgh]

@krwq could you have a look? it is not urgent though.

[krwq]

@tarekgh I've mixed feeling if this should be Globalization or Serialization issue... @shmao - who's usually fixing those kind of test gaps?

[HongGit]

@Benjie-Liu could you see if we need to add tests here?