Add a method to find all the instances of a particular test across platforms and ICU versions

[sven-oly]

To better understand how a particular test works in the platforms and how its status changes across ICU versions:

1. Provide a way to pick a particular test
2. Using the hexhash value for this test
3. Search all the .json files for the test type across platforms and ICU versions
4. In each of these, find the test output for the same hexhash value
5. Show these in a matrix or list, indicating platform, ICU version, and status

Since the expected result may change between versions, present the expected value for each instance.