Modify fuzz all functions to fuzz all functions with valid inputs

[Tmonster]

Currenlty, the fuzz all functions function is fairly primitive and will generate the same fuzzing statements if no new functions are added.

These functions are currently in a weird order (see attachment). It might be nice if the for loop looks more like

for function  in scalar_functions:
     generate_sql(function);

It could also be nice if the functions are applied as a where condition, that way they are tested on different combinations of all_types inputs.

clog_functions.txt