Write props of tests into trx

[nohwnd]

Write Traits into Properties section of TRX.

[TestProperty("some property", "some value")] // MSTest

[Property("some property", "some value")] // NUnit

[Trait("some property", "some value")] //Xunit

TRX:

 <UnitTest name="TestMethod1_1" storage="s:\t\mstest1.dll" id="0b592ca2-9fc4-1d7f-bdcd-3e8f8a552f24">
      <Properties>
        <Property Key="custom-owner" Value="Jakub" />
        <Property Key="my-service" Value="my service" />
        <Property Key="some prop" Value="some value" />
      </Properties>
      <Execution id="4bdf49fd-c016-4258-b63b-c5f8e65352ab" />
      <TestMethod codeBase="S:\t\MSTest1.dll" adapterTypeName="executor://mstestadapter/v2"
         className="MSTest1.UnitTest1" name="TestMethod1_1" />
    </UnitTest>

Where property attributes can be placed is controlled by the testing framework.

• mstest, only on methods
• xunit on classes and methods
• nunit on assemblies, classes, and methods

Each property on assembly and class is propagated to all child tests.