v1.9.0: Prepare release of TF-DF 1.9.0 and update installation instructions

[rstz]

1.9.0 - 2024-03-12

Fix

• Fix max_depth, early stopping parameter documentation.
• Fix plotting contains conditions.

Features

• Compatibility with TensorFlow 2.16.0.
• Expose new parameter sparse_oblique_max_num_projections.
• Using tf_keras instead tf.keras in examples, documentation.
• Support NAConditions for fast engine.
• Faster model loading for models with many features and dense oblique
  conditions.

Documentation

• Clarified documentation of parameters for oblique splits.

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This discussion was created from the release v1.9.0: Prepare release of TF-DF 1.9.0 and update installation instructions.