Add C implementation for @stdlib/math/base/assert/is-even

[aman-095]

Resolves #1666.

Description

What is the purpose of this pull request?

This pull request adds native C implementation for
@stdlib/math/base/assert/is-even.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: Add C implementation for @stdlib/math/base/assert/is-even #1666
• fixes #

Questions

Any questions for reviewers of this pull request?

No.

Other

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No.

Checklist

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

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[Pranavchiku]

Thanks @aman-095 for this! This is ready to merge.

[Planeshifter]

@aman-095 Thanks much for contributing so many C implementations already, it's much appreciated! 🙌

Two small nits for future reference:

1. It's not necessary to update the copyright year in an existing file like the README.md when adding new content to it; we don't update them usually to keep track on when the files were originally added.
2. Would you mind creating PRs such as this with a title such as this:

feat: add C implementation for math/base/assert/is-even

Then the suggested commit message when squashing and merging will be auto-populated with the desired format per our git commit message style guide already, making it easier to merge them.

Thanks again!