[FEATURE] Adding conversions of measurement units

[tommens]

Describe the new functionality you would like to see
This feature request is a bit unrelated to the other functionalities typically provided by a calculator. The suggestions is to propose functionality to convert values from a given measurement unit to another one.
For example, we would like to convert some length measurement between (centi/deci/...)meters/feet/inches/miles/nautical miles/yards. Similar conversions would be for measurement of areas, currency, power, energy, pressure, speed, temperature, time, volume, weight and masses.

Additional context
I have drawn inspiration from another calculator app to show the idea. Obviously, this functionality can also be implemented in a CLI-version of the calculator application.