Add support for (de/re)quantization with shift

[wojtuss]

PR types

New features

PR changes

OPs

Describe

This patch adds support for quantization with shift (aka asymmetric quantization). The support is required by the fusion_gru op quantization (#27330).

Quantization with shift is performed according to the formula:

out_u8 = in_f32 * scale + shift

When shift is nonzero, the output of quantization is always of unsigned int8 data type.
Dequantization formula is:

out_f32 = in_u8/scale - shift/scale

Dequantization with shift expects unsigned int8 input.

Support in quantization passes will come in a separate PR.

[wojtuss]

@luotao1 ,
It seems the builds fail because of some issues with downloading data or models. I have restarted them, but the issue persists. Could you please help with it?

[luotao1]

It seems the builds fail because of some issues with downloading data or models.

#27502 is merged, you can restart it again.

[wojtuss]

@luotao1 ,
The test test_api_impl in the PR-CI-Pretest-Ignore build seems to fail independently of this PR. Could you please help with it?

[luotao1]

I see all required CI passed

[grygielski]

LGTM