[quant] Add from_blob_quantized_per_channel API (#62049)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62049
Adds a new function that accepts qint data blobs as input and creates a per-channel quantized tensor using the pre-allocated data and the provided scale and zero_point inputs
Addresses issue #61777
Test Plan:
./build/bin/quantized_test --gtest_filter='TestQTensor.FromBlobQuantizedPerChannel'
Imported from OSS
Reviewed By: kimishpatel
Differential Revision: D29854136
fbshipit-source-id: da6ecd3fb59a6f40ae88430fdd5d895f93d5411c
