Detect, suppress & replace (with pastebin link) floods

@terrablue's excellent idea from a discussion in #typescript:

```
[4/24/2024, 10:51:56]<blueagain>ed-on-nhex: it could actually be an interesting feature for nhex: suppress extremely big, linkable walls of text (as an opt-in option) and replace them with a short url.
[4/24/2024, 10:52:24]<blueagain>(thinking about the sentiment systemfault expressed; it can only be solved in the client)
```
