feat: add isbn 10/13 fake generation support

[phoenisx]

Closes #367

Description

Adds support for ISBN 10/13 strings in gofakeit library. It's inspired from https://github.com/joke2k/faker/blob/master/faker/providers/isbn

Currently added support for only en-US regions, i.e. 0 & 1 Registration Groups. We can expand this data to support other regions/countries if required in future.

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Let me know your thoughts, and any fixes if necessary, coz this will be my first Golang PR 😅 🎉 🙌🏽

[brianvoe]

Sorry I missed this.

The pr looks good. The only thing i question is the categorization. Instead of creating a new one lets put it under product.

Once that update is done ill get this merged in.

Nice job!

[phoenisx]

Thanks @brianvoe for the review.

I have one concern merging ISBN with Product:

• I can either support ISBN 10 and 13 as two separate properties in Product struct, or
• I support only one ISBN string, which by default sets to ISBN13 and if user passes an option/param (which modifies the Product() function signature) use ISBN 10 or 13 based on that option.

Which one do you think would work the best here?

[brianvoe]

Lets do the more common ISBN 13