Add load_model function for quick start

[florian-huber]

For tutorials or quick tests and adaptation I would like to have a small helper function which

• downloads the most recent model from zenodo
• opens the model

(similar in style to what you can do in tensorflow when loading standard models such as Resnet etc.)

[justinjjvanderhooft]

Good suggestion!!

[niekdejonge]

We have something like this also implemented in MS2Query as well: https://github.com/iomega/ms2query/blob/main/ms2query/run_ms2query.py
Here we do not use the latest version available on Zenodo, but this can be done by changing the doi to the "general doi" instead of a specific version.