Extensions: analytics for existing mobile usage

[jaclync]

Why

To better prioritize the extensions we want to support in the app, it'd be great to understand how often they are used in the orders/products viewed by the merchants. The top priority extensions sorted by active stores count in the last 30 days that also use mobile:

• WooCommerce Product Add-ons: how many opened orders have line items with product add-ons
• WooCommerce Product Bundles: how many opened orders have line items with a bundle product
• WooCommerce Subscriptions: how many opened orders have line items with a subscription product
• WooCommerce Gift Cards: how many opened orders include a gift card redemption - order_details_gift_card_shown
• WooCommerce Min/Max Quantities: how many opened products include min/max quantity rules

Subtasks

• [x] Implement new analytics https://github.com/woocommerce/woocommerce-ios/pull/10332
• [x] Review data 1 week after release pe5pgL-3Cp-p2

[peril-woocommerce[bot]]

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