Prompt2model

Improvements, mostly aimed at getting out the colab demo.

What's Changed
* change end of contribution by zhaochenyang20 in https://github.com/neulab/prompt2model/pull/283
* Fix `prompt_examples.md` typo by Farhaduneci in https://github.com/neulab/prompt2model/pull/284
* Refactor dataset retriever to isolate CLI functions by neubig in https://github.com/neulab/prompt2model/pull/294
* Wording fixes in prompt_examples.md by neubig in https://github.com/neulab/prompt2model/pull/303
* Relax dependencies for the library by neubig in https://github.com/neulab/prompt2model/pull/304
* Make a directory for the dataset retriever by neubig in https://github.com/neulab/prompt2model/pull/308
* Add colab demo by zhaochenyang20 in https://github.com/neulab/prompt2model/pull/290

New Contributors
* Farhaduneci made their first contribution in https://github.com/neulab/prompt2model/pull/284

**Full Changelog**: https://github.com/neulab/prompt2model/compare/v0.0.3...v0.0.4

Fix handling of numerical labels in certain retrieved datasets

There was a problem with the release workflow when we cut the v0.0.1 release, so v0.0.2 fixes this and makes a proper release.

This is the initial release of prompt2model. It implements the entirety of the pipeline as described in our [tech report](https://arxiv.org/abs/2308.12261).