* Refactor HTTP route table population
* Update workflow definition EF store to use abstract IWorkflowInstanceStore
This decoupling is necessary, because the application might not be using EF Core, but e.g. Elasticsearch
* Move workflow state persistence to the default workflow runtime feature
* Update JS handler to provide access to variables during trigger indexing
* Configure Proto.Actor runtime with different workflow pipeline
* Add sample using Proto.Actor runtime
* Replace BookmarkGrain with DB based persistence
