feat: add make commands to generate a custom data provider / persister (#1383)

Author: alanpoulain

core/data-persisters.md

@@ -22,6 +22,11 @@ persist data for a given resource will be used.
 
 ## Creating a Custom Data Persister
 
+If the [Symfony MakerBundle](https://symfony.com/doc/current/bundles/SymfonyMakerBundle) is installed in your project, you can use the following command to generate a custom data persister easily:
+```console
+bin/console make:data-persister
+```
+
 To create a data persister, you have to implement the [`ContextAwareDataPersisterInterface`](https://github.com/api-platform/core/blob/main/src/DataPersister/ContextAwareDataPersisterInterface.php).
 This interface defines only 3 methods:
 

core/data-providers.md

@@ -27,6 +27,11 @@ Note, that if your entity is not Doctrine-related, you need to flag the identifi
 
 ## Custom Collection Data Provider
 
+If the [Symfony MakerBundle](https://symfony.com/doc/current/bundles/SymfonyMakerBundle) is installed in your project, you can use the following command to generate a custom collection data provider easily:
+```console
+bin/console make:data-provider --collection-only
+```
+
 First, your `BlogPostCollectionDataProvider` has to implement the [`CollectionDataProviderInterface`](https://github.com/api-platform/core/blob/main/src/DataProvider/CollectionDataProviderInterface.php):
 
 The `getCollection` method must return an `array`, a `Traversable` or a [`ApiPlatform\Core\DataProvider\PaginatorInterface`](https://github.com/api-platform/core/blob/main/src/DataProvider/PaginatorInterface.php) instance.
@@ -79,6 +84,11 @@ You can find a full working example in the [API Platform's demo application](htt
 
 ## Custom Item Data Provider
 
+If the [Symfony MakerBundle](https://symfony.com/doc/current/bundles/SymfonyMakerBundle) is installed in your project, you can use the following command to generate a custom item data provider easily:
+```console
+bin/console make:data-provider --item-only
+```
+
 The process is similar for item data providers. Create a `BlogPostItemDataProvider` implementing the [`ItemDataProviderInterface`](https://github.com/api-platform/core/blob/main/src/DataProvider/ItemDataProviderInterface.php)
 interface: