Add support for dynamic widgets (#6661)

Adds support for "dynamic combo" widgets where selecting a value on a
combo widget can cause other widgets or inputs to be created.


![dynamic-widgets_00001](https://github.com/user-attachments/assets/c797d008-f335-4d4e-9b2e-6fe4a7187ba7)

Includes a fairly large refactoring in litegraphService to remove
`#private` methods and cleanup some duplication in constructors for
subgraphNodes.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6661-Add-support-for-dynamic-widgets-2a96d73d3650817aa570c7babbaca2f3)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/scripts/widgets.ts

@@ -6,6 +6,7 @@ import type {
   IStringWidget
 } from '@/lib/litegraph/src/types/widgets'
 import { useSettingStore } from '@/platform/settings/settingStore'
+import { dynamicWidgets } from '@/core/graph/widgets/dynamicWidgets'
 import { useBooleanWidget } from '@/renderer/extensions/vueNodes/widgets/composables/useBooleanWidget'
 import { useChartWidget } from '@/renderer/extensions/vueNodes/widgets/composables/useChartWidget'
 import { useColorWidget } from '@/renderer/extensions/vueNodes/widgets/composables/useColorWidget'
@@ -296,5 +297,6 @@ export const ComfyWidgets: Record<string, ComfyWidgetConstructor> = {
   IMAGECOMPARE: transformWidgetConstructorV2ToV1(useImageCompareWidget()),
   CHART: transformWidgetConstructorV2ToV1(useChartWidget()),
   GALLERIA: transformWidgetConstructorV2ToV1(useGalleriaWidget()),
-  TEXTAREA: transformWidgetConstructorV2ToV1(useTextareaWidget())
+  TEXTAREA: transformWidgetConstructorV2ToV1(useTextareaWidget()),
+  ...dynamicWidgets
 }