Add product ID and SKU to wishlist customer data

[jameshalsall]

Description

This adds a product's ID and SKU to the wishlist customer data stored in local storage.

Fixed Issues (if relevant)

N/A

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-cicd2]

All committers have signed the CLA.

[mzeis]

Hi @jameshalsall, thanks for your contribution!

I will process your PR as soon as possible. Please allow some delay because of the holidays.

[mzeis]

@jameshalsall Thank you again for your contribution! Your PR has been merged into 2.3-develop.