add "as" derive helper attribute

[josema03]

This implements the feature requested in the following issue: #113

Please take a look at it and let me know if I need to make any other change to have it merged.

[escritorio-gustavo]

Sorry about the mess, the previous comments were not marking the specific lines I was referring to, but the whole set of changes

[escritorio-gustavo]

I have fixed the merge conflict, but I haven't passed the fix through the compiler, needs to be checked

[escritorio-gustavo]

I have applied the changes I previously requested. @NyxCode, this PR is a pretty significative change. What do you think?

[NyxCode]

I love it! Thanks @josema03, and thank you so much @escritorio-gustavo for putting in the time to clean this up!
Once it's ready, I think this would be a really cool addition.

[escritorio-gustavo]

Hey @NyxCode!
I'm having some trouble merging this with #213, how should these PRs interact in macros/types/named.rs

Edit: I think I got it working (CI passing) but would still like to have you take another look at this file before merging

[NyxCode]

Hey @NyxCode! I'm having some trouble merging this with #213, how should these PRs interact in macros/types/named.rs

Edit: I think I got it working (CI passing) but would still like to have you take another look at this file before merging

Sure, lemme take a look at that!

[NyxCode]

From my side, this is ready to merge!
@escritorio-gustavo Can you take a last look & merge this? <3

[escritorio-gustavo]

LGTM!