nipanel: Extract typing backports into a submodule #52

All 6 tests pass in 8s

10 files ± 0 10 suites ±0 8s ⏱️ +2s
6 tests - 2 6 ✅ - 2 0 💤 ±0 0 ❌ ±0
60 runs - 20 60 ✅ - 20 0 💤 ±0 0 ❌ ±0

Results for commit d86c856. ± Comparison against earlier commit 8d11de5.