Macro generate_binary_signature

macro_rules! generate_binary_signature {
    ($value:ident, { $($user_arm:tt)* },
    [ $(
        $auto_arm:ident=>($con_type:ident,$generic:ident)
        ),*
    ]) => { ... };
}

Generate binary function signature based on the function and the input types The user can provide custom signature for some functions in the form of a regular match arm, and the rest will be generated according to the provided list of functions like this:

AddInt16=>(int16_datatype,Add),

which expand to:

Self::AddInt16 => Signature {
   input: smallvec![
      ConcreteDataType::int16_datatype(),
     ConcreteDataType::int16_datatype(),
   ],
   output: ConcreteDataType::int16_datatype(),
   generic_fn: GenericFn::Add,
},