Triggers for Failed Recurring Payment Retry System

[thenbrent]

Idea here with background and voting: https://automatewoo.canny.io/automatewoo/p/subscription-failed-payment-retry-integration

New triggers for some or all of the following actions would make it possible to use AutomateWoo to manage the emails (and other actions) run by the Failed Recurring Payment Retry System:

• 'woocommerce_subscriptions_before_payment_retry'
• 'woocommerce_subscriptions_after_payment_retry'
• 'woocommerce_subscriptions_before_apply_retry_rule'
• 'woocommerce_subscriptions_after_apply_retry_rule'

One gotcha here is that these hooks are only run when retry rules are defined. It might be desirable to replace the Retry system entirely with workflows.