[Woo POS] Favourite products in POS

[joshheald]

Closes: #

Description

This is a Proof of Concept for using favourites to filter the POS product list, to have custom product lists available in POS. It's only a lightweight, temporary approach, but it might help some merchants if we can get it out really soon.

We already store a list of favourited product IDs in the local storage. This PR adds an option to use that list as a filter on the Products List requests when the toggle is on, and to toggle the favourite state within POS.

It could also work with search, but I've not added it there yet.

Steps to reproduce

Testing information

Screenshots

favourite.products.on.POS.mp4

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