bench: refactor to use dynamic memory allocation in number/uint8/base/add

[piyxsh31]

Resolves a part of #8643

Description

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This pull request:

• replace static memory allocation of large arrays in C benchmark at number/uint8/base/add with dynamic memory allocation

Related Issues

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This pull request has the following related issues:

• [RFC]: replace static memory allocation of large arrays in C benchmarks with dynamic memory allocation (tracking issue) #8643

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
number/uint8/base/add	$\color{green}157/157$ $\color{green}+100.00%$	$\color{green}5/5$ $\color{green}+100.00%$	$\color{green}2/2$ $\color{green}+100.00%$	$\color{green}157/157$ $\color{green}+100.00%$

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

[kgryte]

@piyxsh31 As mentioned in the upstream issue, we are only looking to update benchmarks which may potentially encounter large array sizes, hence the advice to only search for benchmarks which include len (i.e., varying array sizes). Statically allocating 100 elements isn't likely to cause any issues. As such, I'll go ahead and close this PR, along with others that you recently opened which attempt to make similar changes, which are not currently desired.

Thank you for your continued interest in stdlib, and we look forward to your future contributions! 🚀