public static IReadOnlyList<Guid> GetActivationExtensions( 
   Table table
)

public void ExtensionIds1(Table table)
{
  //Add an extension id to a table
  //Check documentation for restrictions on backward compatibility - backward
  //compatibility is limited to ArcGIS Pro 3.1 if an extension id is added.
  //Note: This is an extension method. It is for use in addins only and not CoreHost.
  string extension_id_string = "52d8f3be-b73d-4140-beaf-23d4f9b697ea";
  Guid extension_id = Guid.Parse(extension_id_string);

  //Note: Must be within the lambda of QueuedTask.Run(() => { ...

  //register the extension id with the relevant table
  table.AddActivationExtension(extension_id);

  //Remove an extension id from a table
  //Restores backward compatibility assuming no other compatibility limitations are
  //in place.
  //Note: This is an extension method. It is for use in addins only and not CoreHost.
  table.RemoveActivationExtension(extension_id);

  //Check if a given extension id  is registered with a particular table.
  //Note: This is an extension method. It is for use in addins only and not CoreHost.
  if (table.GetHasActivationExtension(extension_id))
  {
    //TODO - implement custom logic relevant to presence of extension_id
  }

  //Enumerate all extension ids on a given table.
  //Note: This is an extension method. It is for use in addins only and not CoreHost.
  foreach (Guid ext_id in table.GetActivationExtensions())
  {
    //TODO - logic based on extension ids
  }
}