Fix 'enter_key_submit=True' on 'rx.text_area' by carrying custom_code on debounce

[masenf]

Alternative to #4084

• Allow debounce to carry any custom code defined in the child component
• Move special behavior handling to create classmethod to allow carrying of added props when wrapped in debounce (which does not call _render on the child component).

I think this is preferable to the original patch, because it still allows the debounce to work, avoiding typing jank, and it also works with auto_height behavior.

Fix #4080

[TimChild]

@masenf, Works great in the test cases I was using for text areas!
Also, definitely better to take this approach. I was doing more testing this morning and realising how janky things get once it's not running locally!

On a related note. How hard would it be to make the DebounceInput work for the rx.slider as well?
For the slider, rx.set_value doesn't work, so I think there is currently no way to be able to use and set slider values without having a slow value/on_change combo.