Adding `ProblemReport` to the `CatalystSignedDocument`

[Mr-Leshiy]

Summary

Add a ProblemReport gathering during decoding for the CatalystSignedDocument

Description

• Modify the minicbor::Decode trait implementation of the CatalystSignedDocument struct. Replace errors: Vec<anyhow::Error> with the ProblemReport.
• Modify the TryFrom trait implementation of the Metadata struct. Replace errors: Vec<anyhow::Error> with the ProblemReport.
• Modify the TryFrom trait implementation of the AdditionalFields struct. Replace errors: Vec<anyhow::Error> with the ProblemReport.
• Modify the TryFrom trait implementation of the Signatures struct. Replace errors: Vec<anyhow::Error> with the ProblemReport.
• Store gathered ProblemReport inside CatalystSignedDocument as field.