Add integration events to codeunit 50100 SDFileMgt

[Copilot]

This PR adds integration events to codeunit 50100 SDFileMgt to support integrations from dependent extensions.

For each procedure in the codeunit, I've added appropriate OnBefore and OnAfter integration events with the [IntegrationEvent(false, false)] attribute. These integration points allow dependent extensions to hook into the file management operations without modifying the base code.

The integration events follow a consistent pattern:

• OnBefore[ProcedureName] - Triggered at the beginning of each procedure
• OnAfter[ProcedureName] - Triggered after the procedure's main operations are completed

Each event includes relevant parameters that subscribers might need:

• For upload/download operations: the SDFiles record and filename/filepath
• For item-related operations: the Item record
• For JSON operations: both the SDFiles record and the resulting JSON object

Added integration events for the following procedures:

• Upload
• Download
• CreateAndDownloadDataFile
• ImportBlobToPersistentBlob
• FindAndExportPersistentBlob
• SaveReportAsPDF
• ExportContactsAsCSV
• ImportItemPictures
• ExportItemPicture2
• CreateJSON

Example usage from a dependent extension:

[EventSubscriber(ObjectType::Codeunit, Codeunit::SDFileMgt, 'OnBeforeUpload', '', false, false)]
local procedure MyBeforeUploadHandler()
begin
    // Custom logic before upload
end;

[EventSubscriber(ObjectType::Codeunit, Codeunit::SDFileMgt, 'OnAfterUpload', '', false, false)]
local procedure MyAfterUploadHandler(var SDFiles: Record "SD Files"; FilePath: Text)
begin
    // Custom logic after upload
end;

Fixes #1.

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