`lute test` should support per-suite output

[wmccrthy]

Right now, lute test outputs a single casesPassed / casesRan metric accumulated from every test in your project.

It would be helpful to support per-suite output and accumulate only anonymous test cases in a bundled metric.

For example, instead of:

==================================================
TEST RESULTS
==================================================
--------------------------------------------------
Total:  5
Passed: 5 ✓
Failed: 0 ✗
==================================================

We could have something like:

==================================================
TEST RESULTS (SuiteName)
==================================================
--------------------------------------------------
Total:  1
Passed: 1 ✓
Failed: 0 ✗
==================================================

==================================================
TEST RESULTS (OtherSuite)
==================================================
--------------------------------------------------
Total:  1
Passed: 1 ✓
Failed: 0 ✗
==================================================

==================================================
TEST RESULTS (Anonymous Cases)
==================================================
--------------------------------------------------
Total:  1
Passed: 1 ✓
Failed: 0 ✗
==================================================