Add TF weights

Model converted by the [`transformers`' `pt_to_tf` CLI](https://github.com/huggingface/transformers/blob/main/src/transformers/commands/pt_to_tf.py). All converted model outputs and hidden layers were validated against its PyTorch counterpart.

Maximum crossload output difference=1.025e-04; Maximum crossload hidden layer difference=5.341e-05;
Maximum conversion output difference=1.025e-04; Maximum conversion hidden layer difference=5.341e-05;


CAUTION: The maximum admissible error was manually increased to 0.0005!

tf_model.h5

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+size 1943319236