Improve multiple errors output in the Parser

[Larsouille25]

It's said in e769064 that the parser can partialy return multiple errors, it's normal and it can only return multiple errors when an unexpected token is in the while let loop of the function parse() because after the smaller function need to return something and for the moment I don't know how to do it.

But it's planed to when an error occur while parsing a function definition or declaration, to skip tokens related to this AST and push the error into the list and continue parse other function definition / declaration etc ...

Originally posted by @Larsouille25 in https://github.com/zom-lang/zom/issues/30#issuecomment-1669418927

Some improvements :

• (MAYBE) in the expect_token! macro when the token we got isn't what we would want, push the error with context.push_err and try to recall the macro, but idk if it's a good idea ??

[Larsouille25]

Postponed, let's see later if we can improve that