[quant][fx] Add support for GRU in fx graph mode quantization (#91976)
Summary:
might be needed by a meta-internal use case
Test Plan:
python test/test_quantization.py TestQuantizeFxOps.test_rnn
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Subscribers:
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/91976
Approved by: https://github.com/jcaip
