feat: Make list methods of CollectionClients iterable

[Pijukatel]

Description

• All collection clients list method returns an iterator as well.
• All async collection clients list method returns an async iterator as well.
• List of modified clients (same for async clients):
  • ActorCollectionClient
  • BuildCollectionClient
  • RunCollectionClient
  • ScheduleCollectionClient
  • TaskCollectionClient
  • WebhookCollectionClient
  • WebhookDispatchCollectionClient
  • DatasetCollectionClient
  • KeyValueStoreCollectionClient
  • RequestQueueCollectionClient
  • StoreCollectionClient
  • ActorEnvVarCollectionClient
  • ActorVersionCollectionClient

TODO:

• Pick proper names for the new method and interface
• Update docs

Example usage

...
# Sync
datasets_client = ApifyClient(token='...').datasets()

# Same as before
list_page = datasets_client.list(...)

# New functionality
individual_items = [item for item in datasets_client.list(...)]

...
# Async
datasets_client = ApifyClientAsync(token='...').datasets()

# Same as before
list_page = await datasets_client.list(...)

# New functionality
individual_items = [item async for item in datasets_client.list(...)]

Issues

• Partially implements: Add better support for pagination #539
  (Storage-related clients will be in a separate PR)

Testing

• Unit tests
• Manual API tests

Checklist

• CI passed