Add support for growable inputs (#6830)

![autogrow-optional_00002](https://github.com/user-attachments/assets/79bfe703-23d7-45fb-86ce-88baa9eaf582)

Also fixes connections to widget inputs created by a dynamic combo
breaking on reload.

Performs some refactoring to group the prior dynamic inputs code.

See also, the overarching frontend PR: comfyanonymous/ComfyUI#10832

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6830-Add-support-for-growable-inputs-2b36d73d365081c484ebc251a10aa6dd)
by [Unito](https://www.unito.io)

src/utils/typeGuardUtil.ts

@@ -60,3 +60,7 @@ export const isResultItemType = (
 ): value is ResultItemType => {
   return value === 'input' || value === 'output' || value === 'temp'
 }
+
+export function isStrings(types: unknown[]): types is string[] {
+  return types.every((t) => typeof t === 'string')
+}