[Woo POS][Products Search] Pre-search UI: recent searches

[joshheald]

We'll follow the approach outlined here, with any required edits for the different local sync situation on iOS compared to Android.

We'll show the recent searches in a grid along with popular products, to save on space as the keyboard can use a lot of it. The grid can be handled in either issue.

[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.