feat: moved number mod and added tests for the functions

Author: raphael-goetz

src/implementation/mod.rs

@@ -1,11 +1,13 @@
 use crate::registry::HandlerFn;
 
+pub mod boolean;
 pub mod number;
 
 pub fn collect() -> Vec<(&'static str, HandlerFn)> {
     let mut result = vec![];
 
     result.extend(number::collect_number_functions());
+    result.extend(boolean::collect_boolean_functions());
 
     result
 }