Convert scraper to use async (#1915)

* add httpx depedency for async http requests

* rework scraper strategies to download recipe html asynchronously

* rework recipe_data_service to download recipe images asynchronously

* fix recipe_parser test, so it can use async results

* fix bulk import so that it also works with async scraper

* fix broken recipe_parser tests

* Fix issues found by scanners

* Add additional checks for ingredient and instruction count in test_create_by_url

* Revert changes in test recipe_data
Since we are checking ingredients and instructions in test_create_url now, these would fail with the stored html of recipe data

* Add explicit type annotation in recipe_data_service.largest_content_len

* Fix typo in annotation

tests/utils/recipe_data.py

@@ -45,7 +45,7 @@ def get_recipe_test_cases():
             html="jam-roly-poly-with-custard.html",
             html_file=test_data.html_jam_roly_poly_with_custard,
             expected_slug="jam-roly-poly-with-custard",
-            num_ingredients=13,
+            num_ingredients=11,
             num_steps=9,
         ),
         RecipeSiteTestCase(
@@ -54,7 +54,7 @@ def get_recipe_test_cases():
             html_file=test_data.html_sous_vide_shrimp,
             expected_slug="sous-vide-shrimp",
             num_ingredients=5,
-            num_steps=0,
+            num_steps=1,
         ),
         RecipeSiteTestCase(
             url="https://www.bonappetit.com/recipe/detroit-style-pepperoni-pizza",