Add option to use display/friendly names for runs in Tensorboard

When using the [Tensorboard class](https://docs.microsoft.com/en-us/python/api/azureml-tensorboard/azureml.tensorboard.tensorboard?view=azure-ml-py) of the Azure ML SDK, runs are named after their **Run ID**. This makes it hard to compare runs, as you need to remember what the differences are between the IDs.

It would be very much appreciated if you could add an option to use the **Display name** (or allow to set a custom name) for the runs in Tensorboard instead.