Add option alias

[de9uch1]

Add option alias setting alias in metadata of dataclass fields.

[lebrice]

https://github.com/lebrice/SimpleParsing/blob/ed8170a32e7765bd98ed42831a428f0cdb645b67/simple_parsing/helpers/fields.py#L38

[de9uch1]

https://github.com/lebrice/SimpleParsing/blob/ed8170a32e7765bd98ed42831a428f0cdb645b67/simple_parsing/helpers/fields.py#L38

@lebrice
Thank you for your comment.
I've updated pyrallis.field() to be able to pass aliases like SimpleParsing.

[eladrich]

Thanks @de9uch1 for the pull request!

We did consider supporting aliases in the past but decided that it goes against the design we are aiming for. Pyrallis currently uses a simple one-to-one mapping between the input arguments and the dataclass fields and we want to keep enforcing that.

@lebrice's SimpleParsing is indeed a great choice if you need alias support or other advanced features.

Keeping this pull request open if you want to discuss further 🙃

[de9uch1]

Thank you for your reply, @eladrich.

OK, I understand. I think it is a great decision for a simple and consistent design.

I'll decide to create pyrallis-plus, the wrapper of Pyrallis that is added some features at the expense of simplicity.

If there is no problem, I would like to close this PR, is that OK?