docs: update related packages sections

[stdlib-bot]

This PR

• updates the related packages section of READMEs to include links to related packages.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
number/uint64/parse	$\\color{red}213/215$ $\\color{green}+99.07\\%$	$\\color{red}32/33$ $\\color{green}+96.97\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{red}213/215$ $\\color{green}+99.07\\%$
random/base/geometric	$\\color{red}472/475$ $\\color{green}+99.37\\%$	$\\color{red}47/48$ $\\color{green}+97.92\\%$	$\\color{green}11/11$ $\\color{green}+100.00\\%$	$\\color{red}472/475$ $\\color{green}+99.37\\%$

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