Speed test addition

[lelaus]

• [1] add a speed test to the test suite for performance tracking purposes

[lelaus]

In detail:

1. to set the target functions to test;
2. to include the speed test among the regression tests made when pushing new updates to master branch;
3. to take memory about the speed test results across successive pushes;
4. saving artifacts: txt formatted with test name on the rows and performance times on the columns, each one for each column
5. artifacts: it should be only local within the repository (the performance comparison makes sense only within the same platform)

[panDanieleN]

From main action #202 the execution speed of the tests slowed down, probably due to the type check method decorator. Need to decide whether to keep the check or not