Add support for Waymo Open Dataset v1.3.0 training, validation, and test splits

[siddhi47]

This PR introduces three new DatasetConfig entries to enable loading of the full Waymo Open Dataset Motion v1.3.0 release:

• Training Set: Includes 1000 sharded TFRecord files with an optional cap of 10,000 range points per example.
• Validation Set: Includes 150 TFRecord shards.
• Test Set: Includes 150 TFRecord shards.

WOD_1_3_0_TRAINING = DatasetConfig(
    path="gs://waymo_open_dataset_motion_v_1_3_0/uncompressed/tf_example/training/training_tfexample.tfrecord@1000",
    max_num_rg_points=10000,
    data_format=DataFormat.TFRECORD,
)

WOD_1_3_0_VALIDATION = DatasetConfig(
    path="gs://waymo_open_dataset_motion_v_1_3_0/uncompressed/tf_example/validation/validation_tfexample.tfrecord@150",
    data_format=DataFormat.TFRECORD,
)

WOD_1_3_0_TEST = DatasetConfig(
    path="gs://waymo_open_dataset_motion_v_1_3_0/uncompressed/tf_example/testing/testing_tfexample.tfrecord@150",
    data_format=DataFormat.TFRECORD,
)

Why:

These additions ensure the codebase is compatible with the updated v1.3.0 Waymo Motion dataset release and support full-scale training and evaluation using the latest split structures.

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