Enable weight-only quantization with StableHLO opset in TF Quantizer
Enable weight-only quantization with StableHLO opset in TF Quantizer

This CL integrates StableHLO weight-only quantization preset to TF Quantizer API. The weight-only quantization is enabled when the quantization method is set to `METHOD_STATIC_RANGE_WEIGHT_ONLY_INT8` and opset is set to `quant_opts_pb2.STABLEHLO`.
