Fix failing Loc lookups in hosting service (#679)

* Remove XUnit warnings which clogged up output

* Use default namespace to fix loc lookup errors
- Fixed errors due to localization change
- Also removed internals visible attribute that could cause subtle issues where the hosting service doesn't work for other apps if things change

* Add CI build and test for new projects

* Up version number so we can pick up fix in nuget packages

test/Microsoft.SqlTools.Hosting.UnitTests/ExtensibilityTests/ServiceProviderTests.cs

@@ -48,7 +48,7 @@ namespace Microsoft.SqlTools.Hosting.UnitTests.ExtensibilityTests
             var services = provider.GetServices<MyProviderService>();
             // Then I expect empty enumerable to be returned
             Assert.NotNull(services);
-            Assert.Equal(0, services.Count());
+            Assert.Empty(services);
         }
 
         [Fact]