Add unit test project for Azure Storage Provider

[aslotte]

We need some test automation to ensure that are properly setting values when creating experiments, runs and metrics

[Brett-Parker]

There is no unit test project for SQL server either. Required? @aslotte

Looking at this further, the SQLite [TestCategory("UnitTests")] are the same as MLOpsBuilderExtensionTests.cs stored in the SQLServer integration test. Should this be pulled out into a SQLServer unit test proj?