Issue with OpenTelemetry.Exporter.Stackdriver

The current name of exporter is Stackdriver. However, this name is no longer used by Google Cloud. This creates a discoverability issue for new developers who are unaware of the old name Stackdriver.

Since the package is still prerelease, it would be beneficial to rename the exporter to OpenTelemetry.Exporter.GoogleCloudTrace or similar . This change would make the exporter more easily discoverable and align its name with the Google Cloud product naming.

We can keep the reference of Stackdriver in the documentation, so that current users of exporter know that the same has been renamed.

I had raised this as a question in #1167. And based on this suggestion from @Kielek, I am raising a dedicated issue.