feat: add C implementation for stats/base/dists/cosine/mean

[sethdivyansh]

Resolves #3518

Description

• adds C implementation for @stdlib/stats/base/dists/cosince/mean along with relevant tests, benchmarks and examples

This pull request:

• progresses: [RFC]: Add C implementation for @stdlib/stats/base/dists/cosine/mean #3518

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• Read, understood, and followed the contributing guidelines.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/cosine/mean	$\color{green}175/175$ $\color{green}+100.00\%$	$\color{green}9/9$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}175/175$ $\color{green}+100.00\%$

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

[Planeshifter]

/stdlib update-copyright-years

[Planeshifter]

Let's get it in. 🚀

[stdlib-bot]

PR Commit Message

feat: add C implementation for `stats/base/dists/cosine/mean`

PR-URL: https://github.com/stdlib-js/stdlib/pull/3985
Closes: https://github.com/stdlib-js/stdlib/issues/3518

Co-authored-by: Divyansh Seth <divyanshseth08@gmail.com>
Co-authored-by: Philipp Burckhardt <pburckhardt@outlook.com>
Co-authored-by: stdlib-bot <noreply@stdlib.io>
Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>
Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>

Please review the above commit message and make any necessary adjustments.