Autokeras

Breaking changes

* Requires `keras>=3.0.0` instead of `tf.keras`.
* Removed the structured data related tasks by removing the following public
APIs:
* `CategoricalToNumerical`
* `MultiCategoryEncoding`
* `StructuredDataInput`
* `StructuredDataBlock`
* `StructuredDataClassifier`
* `StructuredDataRegressor`
* Removed the Time series related tasks by removing the following public APIs:
* `TimeseriesInput`
* `TimeseriesForecaster`
* Reduced search space of Text related tasks by removing the following blocks.
* `Embedding`
* `TextToIntSequence`
* `TextToNgramVector`
* `Transformer`

Breaking changes

* This only affect you if you use `BertTokenizer` or `BertEncoder` in AutoKeras
explicity. You are not affected if you only use `BertBlock`, `TextClassifier`
or `TextRegressor`. Removed the AutoKeras implementation of `BertTokenizer`
and `BertEncoder`. Use `keras-nlp` implementation instead.

New features

Bug fixes
* Now also support `numpy>=1.24`.