added string to iso code using strum

[lhr0909]

I am trying to add a feature to dynamically add languages in lingua-node, and needed the ability to add language codes from the outside of Rust context.

I saw there is strum so I thought to add the macro into the isocode file and it works like a charm (used a regex find/replace to add this many annotations lol)! Added test make sure the features work.

Let me know if you have any questions on the PR.

Cheers!

[pemistahl]

Hello Simon,

I see why you want this. I'm ok with adding it to Lingua but the implementation can be simplified a lot. Please remove the annotations from the enum variants again. Instead, just add #[strum(ascii_case_insensitive)] to the enum declarations. And please add it to the Language enum as well so that all public enums get this feature for the purpose of consistency. After this has been done, I will merge the PR. Thank you.

[lhr0909]

Had to update strum to 0.21.0, but it seems fine and the tests run without any errors.

[pemistahl]

Please remove the strum attribute serialize_all = "snake_case" from the enums. It is not needed for the code to work and there are no snake case names anyway. Thank you.

[lhr0909]

GitHub issue and PR was down a bit, so I had to put another commit. Please feel free to squash merge! If you want me to clean up on my side, I can run an interactive rebase :D