Added DICOM C-GET, C-MOVE and DICOMWeb support

[ThalesMMS]

This pull request introduces support for C-MOVE and C-GET DIMSE services, and adds a new module for DICOMweb WADO-RS communication. These changes extend the library's networking capabilities to cover additional query/retrieve workflows.

Summary of Additions:

1. New DIMSE Services:

   • C-MOVE SCU: Enables instructing a remote AE to initiate a C-STORE sub-operation to a specified destination.

   • C-GET SCU: Enables retrieving DICOM objects directly over the request association via C-STORE sub-operations.

2. DICOMweb (WADO-RS) Module:

   • A new networking stack for DICOMweb has been added, using URLSession and Swift's async/await.

   • This allows for retrieving DICOM objects (studies, series, instances) from RESTful DICOMweb servers.

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Implementation Details:

1. C-MOVE and C-GET Implementation

• New ServiceClassUser classes CMoveSCU.swift and CGetSCU.swift have been added to manage the client-side logic.

• The corresponding DIMSE messages (CMoveRQ/RSP, CGetRQ/RSP) are now implemented, including handling for sub-operation counters.

• New command-line executables, DcmMove and DcmGet, have been added for direct use and testing of these services.

2. DICOMweb (WADO-RS) Implementation

The new DICOMweb module is structured as follows:

• DICOMWebClient.swift: A base client for handling HTTP requests and authentication (Basic, Bearer Token).

• MultipartParser.swift: A new utility to parse multipart/related responses, which is necessary for WADO-RS. It correctly identifies boundaries and extracts each DICOM part from the response body.

• WADOClient.swift: Implements the WADO-RS specification, providing high-level methods to retrieve studies, series, and instances. It uses the MultipartParser to decode the server's response into DicomFile objects.

• DICOMWebService.swift: A facade that provides a simplified API for using the DICOMweb services.

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How to Test:

Testing DIMSE Services (C-MOVE / C-GET)

Requires a PACS that supports the Query/Retrieve Service Class.

C-MOVE Example:

    # Request a PACS to move a study to the destination AET "MY_WORKSTATION"
    swift run DcmMove -l STUDY -u "[Study Instance UID]" -d "MY_WORKSTATION" PACS_AE pacs.server.com 104

C-GET Example:

    # Retrieve a series and save the files to the "./received" directory
    swift run DcmGet -l SERIES -u "[Series Instance UID]" --output "./received" PACS_AE pacs.server.com 104

Testing DICOMweb (WADO-RS)

Requires a DICOMweb-enabled server (e.g., Orthanc, dcm4chee).

Example Swift Code:

    import DcmSwift
    import Foundation
    
    guard let baseURL = URL(string: "https://your-server.com/dicom-web") else { return }
    let service = DICOMWebService(baseURL: baseURL)
    
    // Optional: Add authentication
    // service.setAuthentication(.basic(username: "user", password: "password"))
    
    let studyUID = "1.2.840.113619.2.55.3.427103571.974.1252332153.511"
    
    Task {
        do {
            print("Retrieving study: \(studyUID)...")
            let dicomFiles = try await service.downloadStudy(studyUID)
            print("Successfully retrieved \(dicomFiles.count) instances.")
        } catch {
            print("Error retrieving study: \(error.localizedDescription)")
        }
    }

RunLoop.main.run(until: Date(timeIntervalSinceNow: 30))