feat: Add CVSS receipt management endpoints and related functionality

- Introduced new API endpoints for creating, retrieving, amending, and listing CVSS receipts.
- Updated IPolicyEngineClient interface to include methods for CVSS receipt operations.
- Implemented PolicyEngineClient to handle CVSS receipt requests.
- Enhanced Program.cs to map new CVSS receipt routes with appropriate authorization.
- Added necessary models and contracts for CVSS receipt requests and responses.
- Integrated Postgres document store for managing CVSS receipts and related data.
- Updated database schema with new migrations for source documents and payload storage.
- Refactored existing components to support new CVSS functionality.

src/Concelier/__Libraries/StellaOps.Concelier.Connector.CertBund/CertBundConnector.cs

@@ -245,7 +245,7 @@ public sealed class CertBundConnector : IFeedConnector
                 continue;
             }
 
-            if (!document.GridFsId.HasValue)
+            if (!document.PayloadId.HasValue)
             {
                 await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.Failed, cancellationToken).ConfigureAwait(false);
                 remainingDocuments.Remove(documentId);
@@ -258,7 +258,7 @@ public sealed class CertBundConnector : IFeedConnector
             byte[] payload;
             try
             {
-                payload = await _rawDocumentStorage.DownloadAsync(document.GridFsId.Value, cancellationToken).ConfigureAwait(false);
+                payload = await _rawDocumentStorage.DownloadAsync(document.PayloadId.Value, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception ex)
             {