build: add import formatting with autoflake and isort #84

All 21 tests pass in 3m 8s

18 files ±0 18 suites ±0 3m 8s ⏱️ ±0s
21 tests ±0 21 ✅ ±0 0 💤 ±0 0 ❌ ±0
378 runs ±0 359 ✅ ±0 19 💤 ±0 0 ❌ ±0

Results for commit 5acdd24. ± Comparison against earlier commit ceb3331.