Consistently check invalid attribute arguments

[ironcev]

Checks for attribute arguments are scattered thought the compiler code and, if done at all, the resulting errors and warnings are not consistent.

E.g., arguments of the #[inline] attribute are not checked at all. This compiles without any warnings or errors:

#[inline(sometimes)]
pub fn inlined_or_not() { }

E.g., the arguments of the #[cfg] attribute are checked both as warnings and as errors:

E.g., the arguments of the #[storage] attribute are checked only as errors, but with different error message: