FR: Deserialize test run result

[tingerrr]

Description

Allow deserializing the results of a test run in some commonly used test suite result format.

Additional Context

The result types are already constructed in a way that lends itself to writing jUnit-compatible XML easily, this is because most of this code has recently been upstreamed from a test runner I wrote at my day job which already support jUnit XML export. I should do some research into other formats and which are most likely to be used.