Change current timing code to use decorators / Make timing optional from config.

[Sharpz7]

Currently, we do: https://github.com/search?q=repo%3Aradoss-org%2Fretuve%20log_timings&type=code

This is inefficient vs having a decorator that can automatically achieve the same thing.

from retuve.timings import functimer

@functimer(title="foo")
def bar():
    pass