Implement a prompt to launch test one by one

With something like : 

```
./42ShellTester --prompt
```

Will run one test, and prompt the user before running the next one, such as : 

```
run test 1... 
<output of test>
V

run next test (yn) > y

run test 2...
<output of test>
... 
```

It should be usefull to check the logger between each tests.
