Enhance RecActionDto with HTTP and query handling

Added new properties to `RecActionDto`:
- `Headers` to store HTTP headers as a dictionary.
- `BodyQuery` to represent a query related to the body.
- `Body` to store the body content.
- `PostprocessingQuery` to represent a query for postprocessing.

These changes improve the class's ability to handle HTTP requests and related operations, providing greater flexibility for preprocessing and postprocessing tasks.

src/ReC.Application/Common/Dto/RecActionDto.cs

@@ -54,8 +54,12 @@ public record RecActionDto
 
     public string? HeaderQuery { get; init; }
 
+    public Dictionary<string, string>? Headers { get; set; }
+
     public string? BodyQuery { get; init; }
 
+    public string? Body { get; set; }
+
     public string? PostprocessingQuery { get; init; }
 
     public UriBuilder ToEndpointUriBuilder()