Introduced a new `PsPdfKitAnnotation` record in the namespace
`EnvelopeGenerator.Application.Common.Dto` to represent PSPDFKit
annotation data. The record includes two parameters: `Instant`
of type `ExpandoObject` and `Structured` of type
`IEnumerable<AnnotationCreateDto>`.
Marked the record with the `[Obsolete]` attribute to indicate
that the PSPDFKit library is deprecated. Added a summary XML
comment to describe the purpose of the record. Also added a
`using` directive for `System.Dynamic` to support `ExpandoObject`.
TekH
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