Introduced `ReadDocReceiverElementQuery` for retrieving document receiver elements and its corresponding handler. Added necessary `using` directives for dependencies like `AutoMapper`, `MediatR`, and `Microsoft.EntityFrameworkCore`.
The handler dynamically filters `DocReceiverElement` data based on optional query parameters (e.g., `Envelope.Id`, `Envelope.Uuid`, `Receiver.Id`, `Receiver.Signature`) using LINQ. Data is fetched asynchronously and mapped to DTOs using `AutoMapper`.
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