[Unity][MSC][M2.4] Add quantizer for quantize model #16228
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This is a pull request for MSC(Multi-System Compile)
RFC: https://discuss.tvm.apache.org/t/rfc-unity-msc-introduction-to-multi-system-compiler/15251/5
Tracking issue: #15233
This is the Milestone 2 for MSC: Use msc.runtime.Manager to manage the compiling pipeline && tools.
To limit each PR in reviewable size, the Milestone 2 will be split into some steps:
M2.1 Add Manager for compile pipeline
M2.2 Add pruner for model pruning
M2.3 Add tracker for track layer datas
M2.4 Add quantizer for quantize model
Quantization is widely used as model optimization methods. MSC implementation of quantizer differs from other frameworks. The quantization process is described as a tool and dispatched to torch/tvm/tensorrt when needed. In this way, the quantization of tvm can be "simulated" in torch (essential for QAT).
cc @Hzfengsy @junrushao