Refactor missing packages dialog into model (MissingPackageList) and controller (InstallMissingPackagesDialog.qml)

Rename classes and files to have unified naming.

CURA-6990

plugins/Marketplace/MissingPackageList.py

@@ -0,0 +1,32 @@
+#  Copyright (c) 2022 Ultimaker B.V.
+#  Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import Optional, TYPE_CHECKING, Dict, List
+
+from .Constants import PACKAGES_URL
+from .PackageModel import PackageModel
+from .RemotePackageList import RemotePackageList
+from PyQt6.QtCore import pyqtSignal, QObject, pyqtProperty, QCoreApplication
+
+from UM.TaskManagement.HttpRequestManager import HttpRequestManager  # To request the package list from the API.
+from UM.i18n import i18nCatalog
+
+if TYPE_CHECKING:
+    from PyQt6.QtCore import QObject, pyqtProperty, pyqtSignal
+
+catalog = i18nCatalog("cura")
+
+class MissingPackageList(RemotePackageList):
+    def __init__(self, parent: Optional["QObject"] = None) -> None:
+        super().__init__(parent)
+        self._package_metadata: List[Dict[str, str]] = []
+        # self.packageTypeFilter = None # This will be our new filter
+        self._package_type_filter = "material"
+
+    def setPackageIds(self, packages: List[Dict[str, str]]) -> None:
+        self._package_metadata = packages
+        search_string = ", ".join(map(lambda package: package["id"], packages))
+        # self.setSearchString(search_string)
+        self.setSearchString("ABS")
+
+