Add `n_rate` statistic to `estimate_incidence_rate()` #3238

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Audit Dependencies 🕵️‍♂️ / oysteR scan 🦪	1m 39s
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Coverage 📔 / Covtracer 🐄	0s
Coverage 📔 / Coverage 📔	11m 1s
gitleaks 💧 / gitleaks 💧	7s
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SuperLinter 🦸‍♀️ / SuperLinter 🦸‍♂️	1m 37s
SuperLinter 🦸‍♀️ / Lint R code 🧶	1m 50s
R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio, version latest	10m 52s
Roxygen 🅾 / Manual pages check 🏁	4m 2s
R CMD Check (non-CRAN) 🧬 / ghcr.io/insightsengineering/rstudio, version latest	9m 4s
Spell Check 🆎 / Check spelling 🔠	1m 33s
Style Check 👗 / Check code style 🔠	2m 2s
Version Check 🏁 / Emoji in NEWS.md 📰	9s
Version Check 🏁 / Version check 🏁	4s
R CMD Check (non-CRAN) 🧬 / Publish JUnit HTML report 📰	0s
R CMD Check (non-CRAN) 🧬 / Upload build tar.gz	0s
R CMD Check 🧬 / Upload build tar.gz	0s
R CMD Check 🧬 / Publish JUnit HTML report 📰	0s
Coverage 📔 / Publish coverage report 📰	0s
	45m 27s

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