Create a "calculated price" formatter

Discussed with bojanz. Since this will have the ability to show taxes that are included, renaming to PriceCalculatedFormatter, "Calculated".

Initial WIP from before.

+++ b/modules/price/config/schema/commerce_price.schema.yml
@@ -28,3 +28,17 @@ field.formatter.settings.commerce_price_default:
+    show_original_price:
+      type: boolean
+      label: 'Display the original price, if resolved price is different'

+++ b/modules/price/src/Plugin/Field/FieldFormatter/PriceCalculatedFormatter.php
@@ -0,0 +1,179 @@
+      'show_original_price' => FALSE,
...
+    $elements['show_original_price'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Display the original price, if resolved price is different.'),
+      '#default_value' => $this->getSetting('show_original_price'),
+    ];
...
+      if ($resolved_amount->equals($item->toPrice())) {

Discussed w/ bojanz. Going to remove the "show original price" option to reduce complexity when working with multiple currencies.

Extended base class, uses price resolver.

We should add tests

Was this committed? It appears that it is not available in Commerce 8.x-2.24. For example, the commerce_cart_services.yml still contains "class: Drupal\commerce_cart\OrderItemMatcher" instead of "class: Drupal\commerce_cart\LineItemMatcher".

Yes. We renamed LineItems to OrderItems after this. Look for "Calculated price" field formatter.