Customer report functions need tweaking

I found what I think is a design flaw in some of the WooCommerce functions, as well as the Customer List report.

wc_get_customer_total_spent() and wc_get_customer_order_count() retrieve orders based on ‘_customer_user’ meta key. Likewise, the ‘Last Order’ column in the Customer List. However, I think this is insufficient. With one client I found that a few previous customers were not logged in, but used their account email for some orders, so the total spent, order count, and last order were off. I created a new report with modified logic, and it looks like I just need the following tweak:

Instead of

'meta_query' => array(
		array(
			'key'     => '_customer_user',
			'value'   => $user->ID
		)
	),

in the order queries, have

'meta_query' => array(
  'relation' => 'OR',
  array(
    'key'     => '_customer_user',
    'value'   => $user->ID
  ),
  array(
    'key'     => '_billing_email',
    'value'   => $user->user_email
  )
),

(In wc_get_customer_total_spent() and wc_get_customer_order_count(), you’d need to load the user from the user ID to get its email).

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