Start to introduce the "Quantizer" tool, which is responsible for...

    Start to introduce the "Quantizer" tool, which is responsible for transforming a computation expressed in floating point to one operating in terms of quantized types (where possible), either using quant-aware-training hints where available or post-training statistics.

    This is being integrated from an experimental side repository piece by piece over the course of several patches and will ultimately include full build support, documentation and e2e tests.

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PiperOrigin-RevId: 248259895