Add On/off switch to timer decorator

[martgra]

In Notebook "Transform_data.md" there is a decorator function called "timer". Use the provided link and add the option to turn the printing of execution time on and off.

Todo:

• Move the function defintion to fpl/utils and a fitting module
• Implement a parameter that turns printing of execution time on and off.

DoD:

• Functions defined with the timer decorator can pass parameter to disable print
• Timer is moved to fpl/utils
• Test is implemented