Add a way to modify or upload a custom pipeline.config

[Pascal36]

It would be great if we can play around with all the settings in pipeline.config. Especially learning_rate_base and the numerous data_augmentation_options.

I noticed adding the following greatly improved my model for 2022.
data_augmentation_options {
random_adjust_brightness {
}
}
data_augmentation_options {
random_adjust_saturation {
}
}