[feature] Run a specific suite/test by using its name

[ngarbezza]

Is your feature request related to a problem? Please describe.

It would be good to execute a particular suite/test giving its name. Most IDEs allow to do that, and for instance, jest has the following: jest --testNamePattern.

Describe the solution you'd like

A new command-line argument called --only that can receive a suite or test name, and it should run only that suite/test. Matching can be exact or by regex (ideal).
In the "starting testy" section, it could specify that it is not running all the test but a subset of them (displaying also which si the string we're using for filtering)