feat: add C implementation for @stdlib/stats/base/dists/normal/cdf

[manvith2003]

Resolves #3771

Description

adds C implementation for @stdlib/stats/base/dists/normal/cdf along with relevant tests, benchmarks and examples.

This pull request:

Resolves: [RFC]: Add C implementation for @stdlib/stats/base/dists/normal/cdf #3771

Questions

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No.

Other

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Checklist

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

• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/normal/cdf	$\color{green}299/299$ $\color{green}+100.00\%$	$\color{green}25/25$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}299/299$ $\color{green}+100.00\%$

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