Add support for CommonJS Modules

[gustavo-cunha-alves]

Hi!

Recently, when attempting to import the library using CommonJS as follows:

const pRetry = require('p-retry');

I received the following error:
Detailed stack trace: Error [ERR_REQUIRE_ESM]: require() of ES Module <stack-files> not supported. Instead change the require of index.js in <stack-files> to a dynamic import() which is available in all CommonJS modules.

While researching the problem, I found a possible solution in this Stack Overflow post. The solution involves making some additional configurations to add CommonJS support to the library. This could significantly enhance the library's experience for developers who use JavaScript and CommonJS.

Thanks

[sindresorhus]

https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c