Missing `errorText` and `helperText` parameters in M3 `DropdownMenu` 

## Steps to Reproduce

1. Add a DropdownMenu widget
2. Try to add errorText and helperText

**Expected results:** 
Show an error message and supporting text, similar to the DropdownButton.

**Actual results:**
The parameters for error and helper style are inside the InputDecorationTheme class, but not the parameters for the texts.