feat: add support for secant functionality lib/node_modules/@stdlib/math/base/special/sec

[AbhijitRaut04]

Resolves #225

Add the secant functionality using the existing cosine and sine functions.

The PR fullfills the purpose of calculating secant of a number.

This pull request:

• is able to calculate secant of a number.

This pull request:

• resolves RFC: add support for computing the secant (sec) #225

Questions

What modifications should I make for this PR ?

Checklist

• Read, understood, and followed the contributing guidelines

@stdlib-js/reviewers

@kgryte
@Planeshifter

[stdlib-bot]

Hello! Thank you for your contribution to stdlib.

We noticed that the contributing guidelines acknowledgment is missing from your pull request. Here's what you need to do:

1. Please read our contributing guidelines.

2. Update your pull request description to include this checked box:

   - [x] Read, understood, and followed the [contributing guidelines](https://github.com/stdlib-js/stdlib/blob/develop/CONTRIBUTING.md)

This acknowledgment confirms that you've read the guidelines, which include:

• The developer's certificate of origin
• Your agreement to license your contributions under the project's terms

We can't review or accept contributions without this acknowledgment.

Thank you for your understanding and cooperation. We look forward to reviewing your contribution!

[stdlib-bot]

👋 Hi there! 👋

And thank you for opening your first pull request! We will review it shortly. 🏃 💨