Introduce `ReceiverClaimExtensions` and `SenderClaimExtensions` classes in the `EnvelopeGenerator.API.Extensions` namespace. These classes provide methods to extract specific claims from a `ClaimsPrincipal` object, aiding in user authentication.
In `ReceiverClaimExtensions.cs`, add methods to retrieve envelope-specific claims such as `EnvelopeUuid`, `ReceiverSignature`, `ReceiverMail`, `EnvelopeId`, and `ReceiverId`. Implement `GetRequiredClaimValue` to handle missing claims.
In `SenderClaimExtensions.cs`, add methods to extract sender-related claims like `GetId`, `GetUsername`, `GetName`, `GetPrename`, and `GetEmail`. Implement `GetRequiredClaimOfSender` for handling missing claims.
Both classes include XML documentation for clarity on method usage and exceptions.
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