Change package name from "evaluate" to something less generic

I'm repeatedly finding myself in situations where I want to have a package called `datasets.py` or `evaluate.py` in my code and can't because those names are being taken up by Huggingface packages. While I can understand how (even from the user's perspective) it's aesthetically pleasing to have nice terse library names, ultimately a library hogging simple names like this is something I find short-sighted, impractical and at my most irritable, frankly rude.

My preference would be a pattern like what you get with all the other big libraries like numpy or pandas:

```
import huggingface as hf
# hf.transformers, hf.datasets, hf.evaluate
```

or things like

```
import huggingface.transformers as tf
# tf.load_model(), etc
```

If this isn't possible for some technical reason, at least just call the packages something like `hf_transformers` and so on.

I realize this is a very big change that's probably been discussed internally already, but I'm making this issue and sister issues on each huggingface project just to start the conversation and begin tracking community feeling on the matter, since I suspect I'm not the only one who feels like this.

Sorry if this has been requested already on this issue tracker, I couldn't find anything looking for terms like "package name".

Sister issues:
- [transformers](https://github.com/huggingface/transformers/issues/24934)
- [datasets](https://github.com/huggingface/datasets/issues/6053)
- **evaluate**