Expand Workflow Examples - Add Patterns Per Folder

The sdks should align. Currently the java and dotnet sdk include workflow patterns in their respective example directories. See the [java sdk workflow examples patterns directory here](https://github.com/dapr/java-sdk/tree/master/examples/src/main/java/io/dapr/examples/workflows) && [see dotnets here.](https://github.com/dapr/dotnet-sdk/tree/master/examples/Workflow)

The go-sdk should include a folder per workflow pattern as well for consistency across the sdks.

Inspect the Go SDK's existing workflow examples and compare their organization with the linked Java and .NET workflow example directories. Identify the workflow patterns currently represented, then arrange the Go examples into a folder per pattern and verify that the resulting structure aligns across the SDKs.

Written by the indexing model from the issue text.