* Add Stock Status to Product Query block filters
Creates a new Tools Panel called “Product filters” where we can neatly
organize our product specific settings. Eventually, this panel could be
merged with the core “Filters” panel; however, at the time of this
commit, this is impossible (see WordPress/gutenbergwoocommerce/woocommerce-blocks#43684 for a PoC).
Also moved the “On Sale” setting under this newly created panel.
* Add `resetAll` callback for the new Tools Panel
Tools Panels come with a “Reset All” functionality, that's supposed to
return all the settings to their original state.
In our case, things are a bit more complicated, as the original state
is dependant on the current variation, so it can't be hard-coded like it
is on the core block.
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