Legalize quantized stablehlo operation using uniform_quantize/uniform_dequantize

[sdasgup3]

This PR provides with a pass to decompose StableHLO quantized programs using uniform quantize/dequantize operations. For example, the following program

```mlir
func.func @add(%arg0: tensor<!quant.uniform<i8:f32,1.0:0>>, %arg1: tensor<!quant.uniform<i8:f32,2.0:1>>) ->  tensor<!quant.uniform<i8:f32,3.0:2>> {
  %0 = "stablehlo.add"(%arg0, %arg1) : (tensor<!quant.uniform<i8:f32,1.0:0>>, tensor<!quant.uniform<i8:f32,2.0:1>>) -> tensor<!quant.uniform<i8:f32,3.0:2>>
  func.return %0 : tensor<!quant.uniform<i8:f32,3.0:2>>
}
```

Will become:

```mlir
func.func @add(%arg0: tensor<!quant.uniform<i8:f32, 1.000000e+00>>, %arg1: tensor<!quant.uniform<i8:f32, 2.000000e+00:1>>) -> tensor<!quant.uniform<i8:f32, 3.000000e+00:2>> {
  %0 = stablehlo.uniform_dequantize %arg0 : (tensor<!quant.uniform<i8:f32, 1.000000e+00>>) -> tensor<f32>
  %1 = stablehlo.uniform_dequantize %arg1 : (tensor<!quant.uniform<i8:f32, 2.000000e+00:1>>) -> tensor<f32>
  %2 = stablehlo.add %0, %1 : tensor<f32>
  %3 = stablehlo.uniform_quantize %2 : (tensor<f32>) -> tensor<!quant.uniform<i8:f32, 3.000000e+00:2>>
  return %3 : tensor<!quant.uniform<i8:f32, 3.000000e+00:2>>
}

Per the docs/spec.md, following is the exhaustive list of ops which can be interpreted using dq-op-q strategy. The current PR handles all these ops except for un-bolded ones (DotGeneralOp, ConvolutionOp, DynamicConvOp, and AddOp) which are already lowered to integer match using --stablehlo-legalize-quant-to-int pass.

1. AbsOp
2. AddOp
3. Atan2Op
4. BatchNormGradOp
5. BatchNormInferenceOp
6. BatchNormTrainingOp
7. CbrtOp
8. CeilOp
9. CholeskyOp
10. ClampOp
11. CompareOp
12. ConvolutionOp
13. CosineOp
14. DivOp
15. DotGeneralOp
16. DynamicConvOp
17. Expm1Op
18. ExpOp
19. FloorOp
20. Log1pOp
21. LogisticOp
22. LogOp
23. MaxOp
24. MinOp
25. MulOp
26. NegOp
27. PowOp
28. ReducePrecisionOp
29. RemOp
30. RoundOp
31. RoundNearestEvenOp
32. RsqrtOp
33. SelectOp
34. SignOp
35. SineOp
36. SqrtOp
37. SubtractOp
38. TanhOp
39. TriangularSolveOp