bench: refactor random number generation in stats/base/dists/beta

[anandkaranubc]

Resolves none.

Description

What is the purpose of this pull request?

This pull request:

• Refactors random number generation in JS benchmarks for stats/base/dists/beta.
• Replaces randu() with uniform() for cleaner and more consistent code.
• Moves the random number generation outside the benchmarking loops.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves none

Questions

Any questions for reviewers of this pull request?

No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

---

@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/beta/cdf	$\color{green}249/249$ $\color{green}+100.00\%$	$\color{green}27/27$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}249/249$ $\color{green}+100.00\%$
stats/base/dists/beta/ctor	$\color{green}487/487$ $\color{green}+100.00\%$	$\color{green}34/34$ $\color{green}+100.00\%$	$\color{green}19/19$ $\color{green}+100.00\%$	$\color{green}487/487$ $\color{green}+100.00\%$
stats/base/dists/beta/entropy	$\color{green}125/125$ $\color{green}+100.00\%$	$\color{green}6/6$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}125/125$ $\color{green}+100.00\%$
stats/base/dists/beta/kurtosis	$\color{green}126/126$ $\color{green}+100.00\%$	$\color{green}6/6$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}126/126$ $\color{green}+100.00\%$
stats/base/dists/beta/logcdf	$\color{green}253/253$ $\color{green}+100.00\%$	$\color{green}27/27$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}253/253$ $\color{green}+100.00\%$
stats/base/dists/beta/logpdf	$\color{green}298/298$ $\color{green}+100.00\%$	$\color{green}45/45$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}298/298$ $\color{green}+100.00\%$
stats/base/dists/beta/mean	$\color{green}185/185$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}185/185$ $\color{green}+100.00\%$
stats/base/dists/beta/median	$\color{green}119/119$ $\color{green}+100.00\%$	$\color{green}6/6$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}119/119$ $\color{green}+100.00\%$
stats/base/dists/beta/mgf	$\color{green}321/321$ $\color{green}+100.00\%$	$\color{green}22/22$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}321/321$ $\color{green}+100.00\%$
stats/base/dists/beta/mode	$\color{green}182/182$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}182/182$ $\color{green}+100.00\%$
stats/base/dists/beta/pdf	$\color{green}299/299$ $\color{green}+100.00\%$	$\color{green}45/45$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}299/299$ $\color{green}+100.00\%$
stats/base/dists/beta/quantile	$\color{green}234/234$ $\color{green}+100.00\%$	$\color{green}23/23$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}234/234$ $\color{green}+100.00\%$
stats/base/dists/beta/skewness	$\color{green}195/195$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}195/195$ $\color{green}+100.00\%$
stats/base/dists/beta/stdev	$\color{green}195/195$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}195/195$ $\color{green}+100.00\%$
stats/base/dists/beta/variance	$\color{green}190/190$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}190/190$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

LGTM. Thanks for working on this, @anandkaranubc!