* Modified POST execute API to show body in Swagger and resolved type-casting error in GET execute API
Modified the POST execute API to display the body in Swagger documentation and resolved the type-casting error in the GET execute API
* Added IExecutionRequest interface defines a contract for Request classes
* Moved the serialization logic into request classes
* Add missing import and reformat ActivityHandle property
Included the Elsa.Workflows.Models import in Models.cs to fix missing reference. Removed redundant ActivityHandle assignment in EndpointBase.cs to improve clarity and reduce redundancy.
* Added support to retrieve the workflow details(i.e., WorkflowDefinitionId, WorkflowDefinitionVersionId, WorkflowDefinitionVersion, WorkflowInstanceId) through Liquid script
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Co-authored-by: Sipke Schoorstra <sipkeschoorstra@outlook.com>
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