System information

• TensorFlow version (you are using): 2.3.0
• Are you willing to contribute it (Yes/No): No

Describe the feature and the current behavior/state.
When calling tensorflow.keras.preprocessing.image.ImageDataGenerator.flow_from_directory, currently a message like Found 1437 images belonging to 2 classes. is printed.

I suggest adding an optional keyword argument verbose with default setting verbose=1 to this function, such that verbose=0 suppresses this printed message. See e.g. the verbose keywords of tf.keras.Model.fit, or of the EarlyStopping or ModelCheckpoint callbacks.

Will this change the current api? How?
This will add an optional keyword argument.

Who will benefit with this feature?

• Everyone who needs to call this function repeatedly in order to loop over different batch_size values during hyperparameter tuning. In this case, the repeated message is uninteresting and distracts from the interesting output and should therefore be omittable.
• Everyone who upgraded from standalone Keras (which did not show this message, e.g. version 2.2.4), who wants to get the same output as before.