Add Cohen's dz for paired samples and one-sample Cohen's d documentation #66

Job	Run time
test-core (macos-latest, 3.14)	55s
test-core (windows-latest, 3.12)	1m 58s
test-core (ubuntu-latest, 3.12)	1m 19s
test-core (macos-latest, 3.12)	56s
test-core (macos-latest, 3.10)	1m 9s
test-core (windows-latest, 3.14)	2m 13s
test-core (ubuntu-latest, 3.14)	1m 22s
test-core (windows-latest, 3.10)	1m 50s
test-dependency-combinations (ubuntu-latest, 3.14, scipy, numpy, pandas, statsmodels, scikit-lear...	1m 21s
test-dependency-combinations (ubuntu-latest, 3.12, scipy==1.14.1, numpy==2.1.3, pandas==2.3.3, st...	1m 40s
test-core (ubuntu-latest, 3.10)	1m 13s
test-dependency-combinations (windows-latest, 3.13, scipy==1.17.0, numpy==2.4.0, pandas==3.0.0, s...	2m 10s
test-dependency-combinations (windows-latest, 3.10, scipy==1.8.0, numpy==1.22.4, pandas==2.1.1, s...	1m 56s
test-dependency-combinations (ubuntu-latest, 3.13, scipy==1.17.0, numpy==2.4.0, pandas==3.0.0, st...	1m 23s
test-dependency-combinations (ubuntu-latest, 3.11, scipy==1.9.3, numpy==1.25.2, pandas==2.2.0, st...	50s
test-dependency-combinations (windows-latest, 3.11, scipy==1.9.3, numpy==1.25.2, pandas==2.2.0, s...	1m 29s
test-dependency-combinations (ubuntu-latest, 3.10, scipy==1.8.0, numpy==1.22.4, pandas==2.1.1, st...	40s
test-dependency-combinations (windows-latest, 3.12, scipy==1.14.1, numpy==2.1.3, pandas==2.3.3, s...	2m 36s
test-dependency-combinations (windows-latest, 3.14, scipy, numpy, pandas, statsmodels, scikit-lea...	2m 15s
	29m 15s

Provide feedback