* 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
* Initial working grain
* Incremental work on actor bookmark management & resuming wokflows
* Upgrade Proto Actor package references
* Fix lifetime of actors
* Implement bookmark and resumption
* Update Program.cs
* Update bookmark event publishing
* Refactor proto actor features API
* Implement snapshotting
* Update snapshotting
* Add in-memory provider and use it by default
* Update server bundle to use proto actor sqlite persistence by default