Add an option to output order of test execution

[joelwurtz]

This allow to debug in which order test has been in success or failure, this allow to better debug case when some tests are failing if executed before or after another one which can happens in a slower / faster / different environment

[joelwurtz]

This is what it output if this option is used:

Asynit Test suite

................                             16 / 16 (100%)

Time: 7.01 seconds, Memory: 6.4MB

OK, Tests: 16, Assertions: 15.

Test orders:

 - #0 Asynit\Tests\FunctionalTests::testReturn
 - #1 Asynit\Tests\FunctionalTests::testStartParallel
 - #2 Asynit\Tests\AnotherTest::test_from_another_file
 - #3 Asynit\Tests\FunctionalTests::testDependFromAnotherFile depends on #2
 - #4 Asynit\Tests\FunctionalTests::get_a
 - #5 Asynit\Tests\FunctionalTests::get_b depends on #4
 - #6 Asynit\Tests\FunctionalTests::test_c depends on #4, #4, #5
 - #7 Asynit\Tests\AnotherTest::get_d
 - #8 Asynit\Tests\FunctionalTests::test_c_with_d depends on #4, #4, #5, #7
 - #9 Asynit\Tests\FunctionalTests::testGet
 - #10 Asynit\Tests\FunctionalTests::testDepend depends on #9
 - #11 Asynit\Tests\FunctionalTests::testException
 - #12 Asynit\Tests\HttpClientOverrideTest::testFoo2
 - #13 Asynit\Tests\HttpClientOverrideTestPromise::testFoo2
 - #14 Asynit\Tests\FunctionalTests::testParallel1
 - #15 Asynit\Tests\FunctionalTests::testParallel4
 - #16 Asynit\Tests\FunctionalTests::testParallel2
 - #17 Asynit\Tests\FunctionalTests::testParallel3
 - #18 Asynit\Tests\FunctionalTests::testEndParallel depends on #1, #14, #16, #17, #15

[lyrixx]

Thanks