feat(addToCartWorkflow): Add beforeAddToCart hook

[Alexnortung]

This PR adds a hook to the addToCartWorkflow

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[riqwan]

nice! I'll tag @thetutlage in this one as he was spear heading this. We might need a more uniform naming pattern.

[adrien2p]

Great 🎉 we will loop back internally in order to validate the API for this hook 👍

[Alexnortung]

Hello @adrien2p , did you forget about this?

Can I also add a hook for after the items have been added to the cart?

[adrien2p]

Hello @adrien2p , did you forget about this?

Can I also add a hook for after the items have been added to the cart?

Hi @Alexnortung sorry for the late response, I haven't forgot about it and shared it internally, unfortunately other priorities have taken my time at the moment.

cc @srindom