[Feature Request] Submit Code Directly without File

[RimuruChan]

Description of the enhancement request

Finding the file is a hassle and you may forget to save it. And copying the code and submitting it is very smooth.

The goal you want to achieve

Code can be submitted directly without having to select a file.

Expected behaviour

1. Click Submit
2. Select a problem
3. Paste the code
4. Submit

Any other information that you want to share?

[nickygerritsen]

See #2720, someone is working on this already 😄