[quant] Add from_blob_quantized_per_tensor API (#61986)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61986
Adds a new function that accepts qint data blobs as input and creates a quantized tensor using the pre-allocated data and the provided scale and zero_point inputs
Addresses issue https://github.com/pytorch/pytorch/issues/61777
Test Plan:
./build/bin/quantized_test --gtest_filter='TestQTensor.FromBlobQuantizedPerTensor'
Imported from OSS
Reviewed By: kimishpatel
Differential Revision: D29831135
fbshipit-source-id: b08299bbe9e939fedff98a585e6b12c14d31f17e
