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

[vivekmaurya001]

Resolves #3428.

Description

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

This pull request:

• Progresses: [RFC]: Add C implementation for @stdlib/stats/base/dists/beta/mean #3428

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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/beta/mean	$\color{green}185/185$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}185/185$ $\color{green}+100.00\%$

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

[vivekmaurya001]

@Planeshifter done the changes please give a look

[Planeshifter]

Let's get it landed. Thanks @vivekmaurya001 for all your contributions!

[stdlib-bot]

PR Commit Message

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

PR-URL: https://github.com/stdlib-js/stdlib/pull/3895
Closes: https://github.com/stdlib-js/stdlib/issues/3428

Co-authored-by: Philipp Burckhardt <pburckhardt@outlook.com>
Co-authored-by: Vivek Maurya <vm8118134@gmail.com>
Co-authored-by: Vivek maurya <155618190+vivekmaurya001@users.noreply.github.com>
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.