Feature Request: Grouping all diagnostics when show border

Instead of each diagnostic separated in each box:
![image](https://github.com/dgagn/diagflow.nvim/assets/20581504/d83f65d8-d63d-4d03-ab88-220eef00199c)
I want it to be combined into one:
![image](https://github.com/dgagn/diagflow.nvim/assets/20581504/4218bd64-3383-4237-a316-cc51e1bd3e1a)

