add `ard_svychisq()` function #357

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R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio, version latest	3m 16s
Roxygen 🅾 / Manual pages check 🏁	2m 41s
Spell Check 🆎 / Check spelling 🔠	3m 45s
Style Check 👗 / Check code style 🔠	1m 40s
Version Check 🏁 / Emoji in NEWS.md 📰	7s
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	21m 35s

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