Adding stat_names and support for row/col splits and `ContentRow` #477

All 217 tests pass in 1m 34s

1 files ±0 28 suites ±0 1m 34s ⏱️ ±0s
217 tests ±0 217 ✅ ±0 0 💤 ±0 0 ❌ ±0
1 577 runs ±0 1 577 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit 948d68d. ± Comparison against earlier commit 4cd4edb.