Calculate and log stability metric for each operation

[yruslan]

Background

Stability metric is computed based on the number of input and output dependencies:

• I - number of input dependencies - the number of operations the selected operation depends on.
• O - output of dependencies - the number of operations the selected operation depends on.
• S - stability metric, where 0 maximum unstable (can be changed without affecting other components, and close to 1 is maximum stable, e.g. is harder to change since many other operations depend on it.

Once stability metrics are calculated, we can check if stable components depend on unstable components and give a note about it.

More on the topic: https://ericbackhage.net/clean-code/the-stable-dependencies-principle/ and https://medium.com/@endika_iglesias/how-to-calculate-the-stability-of-a-component-957bb66af3f7

Feature

Calculate and log stability metric for each operation.