add `h_glm_negbin()` #1787

All 786 tests pass, 26 skipped in 1m 5s

1 files ±0 82 suites ±0 1m 5s ⏱️ -4s
812 tests ±0 786 ✅ ±0 26 💤 ±0 0 ❌ ±0
1 719 runs ±0 1 064 ✅ ±0 655 💤 ±0 0 ❌ ±0

Results for commit 13e0e9f. ± Comparison against earlier commit ea5a014.