Add with_print_calls method

[st0012]

Sometimes it's annoying to break a series of methods chain into several lines, just to call print_calls on an object. For example:

# we need to change this
SomeService.new(params).do_something

# into

s = SomeService.new(params)
print_calls(s)
s.do_something

For such cases, I'd like to add .with_print_calls method to the Object class. Then we can do

SomeService.new(params).with_print_calls.do_something