use a proper test reporter

[Thecarisma]

OK, the current test reporter is garbage and not easy to manage at all. I am looking at portion the library to systems with very small memory and interfaces hence there might be a need to remote failures or errors in a non-textual way, e.g. on andruino failure can be reported with red light and success can be reported with a green light.

e.g.
To report the test execution on andruino using a red and green led

CESTER_REPORTER_FINAL(_, exit_code, {
     if (exit_code == EXIT_SUCCESS) {
         digitalWrite(GREEN_LED_BUILTIN, HIGH);
         return;
    }
    digitalWrite(RED_LED_BUILTIN, HIGH);
});

In the current implementation it possible but that will be a crazy task to achieve, with a proper reporter interface that will be easily achievable and more test report format like subunit, key-value can be easily integrated.

Also, the new report should provide an interface to intercept or/and allow the creation of custom reports.

CESTER_REPORTER_EXPECT_ACTUAL(cr1, pass, test_case, expect, actual, {
     if (pass == 1) {
         printf("The test in test case %s passes --- expected %s received %s\n", test_case->name, expect, actual);
    }
});