Gf32Bit Conversion for BooleanArray

[danielmasny]

currently we implement

impl TryFrom<$name> for Vec<Gf32Bit>

in the macro that implements any BA type (and $name is the name of the BA type e.g. BA256).

The task is to replace Vec<Gf32Bit> with an array using constant generics or a GenericArray. Ideally this is done with minimal propagation of the constant generic or ArrayLength type.