Re-add the CloudSync functionality

It got removed in the marketplace upgrade.

CURA-9146

plugins/Marketplace/CloudApiModel.py

@@ -0,0 +1,29 @@
+from typing import Union
+
+from cura import ApplicationMetadata
+from cura.UltimakerCloud import UltimakerCloudConstants
+
+
+class CloudApiModel:
+    sdk_version = ApplicationMetadata.CuraSDKVersion  # type: Union[str, int]
+    cloud_api_version = UltimakerCloudConstants.CuraCloudAPIVersion  # type: str
+    cloud_api_root = UltimakerCloudConstants.CuraCloudAPIRoot  # type: str
+    api_url = "{cloud_api_root}/cura-packages/v{cloud_api_version}/cura/v{sdk_version}".format(
+            cloud_api_root = cloud_api_root,
+            cloud_api_version = cloud_api_version,
+            sdk_version = sdk_version
+        )  # type: str
+
+    # https://api.ultimaker.com/cura-packages/v1/user/packages
+    api_url_user_packages = "{cloud_api_root}/cura-packages/v{cloud_api_version}/user/packages".format(
+        cloud_api_root=cloud_api_root,
+        cloud_api_version=cloud_api_version,
+    )
+
+    @classmethod
+    def userPackageUrl(cls, package_id: str) -> str:
+        """https://api.ultimaker.com/cura-packages/v1/user/packages/{package_id}"""
+
+        return (CloudApiModel.api_url_user_packages + "/{package_id}").format(
+            package_id=package_id
+        )