Removed the `EmailAddress` property from the `SignCommand` class, which previously retrieved the receiver's email address and threw an exception if the receiver was null. This change eliminates reliance on `EnvelopeReceiver`.
Removed the `ToJson` extension method usage and the associated `using EnvelopeGenerator.Application.Common.Extensions;` directive, as well as the unused `using EnvelopeGenerator.Domain.Constants;` directive.
Marked the `PsPdfKitAnnotation` property as `[Obsolete]`, directing users to use `Signature.Commands.SignCommand` instead, signaling a transition to a newer implementation.
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