* Add endpoints for activity execution records and summaries
Created new classes and endpoints to handle activity execution records and summaries retrieval. Added related models and updated relevant interfaces.
* Rename endpoint classes for clarity
Updated endpoint classes in `ActivityExecutions` and `ActivityExecutionSummaries` to use the name `Endpoint` instead of `List`. This improves readability and consistency in the codebase.
* Remove unused NOOP stores
* Add activity execution manager and FindAsync method to store
The notification is used to broadcast changes to SignalR clients.
* Refactor ActiveActivityExectionContexts
Instead, the workflow state extractor is in control of what gets extracted.
* Add missing files for activity execution deleted broadcast
* Update Flowchart to not fault when child faults
* Update Flowchart to support scheduling existing activity instances
* Update namespaces from Services to Stores
* Improve activity cancellation alteration
* Update ScheduleActivity alteration