[PM-22105] Extract CollectionService.SaveAsync into commands (#5959)

* Add CreateCollectionCommand and associated interface with validation logic

* Implement CreateCollectionCommand to handle collection creation with organization checks and access permissions.
* Introduce ICreateCollectionCommand interface for defining the collection creation contract.
* Add unit tests for CreateCollectionCommand to validate various scenarios including permission checks and error handling.

* Add UpdateCollectionCommand and associated interface with validation logic

* Implement UpdateCollectionCommand to handle collection updates with organization checks and access permissions.
* Introduce IUpdateCollectionCommand interface for defining the collection update contract.
* Add unit tests for UpdateCollectionCommand to validate various scenarios including permission checks and error handling.

* Add scoped services for collection commands

* Register ICreateCollectionCommand and IUpdateCollectionCommand in the service collection for handling collection creation and updates.

* Refactor CollectionsController to use command interfaces for collection creation and updates

* Updated CollectionsController to utilize ICreateCollectionCommand and IUpdateCollectionCommand for handling collection creation and updates, replacing calls to ICollectionService.
* Adjusted related unit tests to verify the new command implementations.

* Refactor ICollectionService and CollectionService to remove SaveAsync method

* Removed the SaveAsync method from ICollectionService and its implementation in CollectionService.
* Updated related tests in CollectionServiceTests to reflect the removal of SaveAsync, ensuring existing functionality remains intact.

* Remove unused organization repository dependency from CollectionServiceTests

src/Core/OrganizationFeatures/OrganizationCollections/Interfaces/ICreateCollectionCommand.cs

@@ -0,0 +1,17 @@
+using Bit.Core.Entities;
+using Bit.Core.Models.Data;
+
+namespace Bit.Core.OrganizationFeatures.OrganizationCollections.Interfaces;
+
+public interface ICreateCollectionCommand
+{
+    /// <summary>
+    /// Creates a new collection.
+    /// </summary>
+    /// <param name="collection">The collection to create.</param>
+    /// <param name="groups">(Optional) The groups that will have access to the collection.</param>
+    /// <param name="users">(Optional) The users that will have access to the collection.</param>
+    /// <returns>The created collection.</returns>
+    Task<Collection> CreateAsync(Collection collection, IEnumerable<CollectionAccessSelection> groups = null,
+        IEnumerable<CollectionAccessSelection> users = null);
+}