[quant][pt2e] Change input act annotation to a map and allow dynamic quantization for non zeroth argument (#101005)
Summary:
Previously the node annotation looks like the following:
```
node.meta["..."] = {
"input_act_obs_or_fq_ctr": ...,
"weight_obs_or_fq_ctr": ...,
"weight_index": 1,
}
```
Basically we need specifiy the index for weight and also have a separate key for weight config, in this PR we changed that to:
```
node.meta["..."] = {
"input_act_obs_or_fq_ctr_map": {input_node: ..., weight_node: ...},
}
```
This can support specifying the observer/fake quant constructor for any argument of the node
Test Plan: buck2 test @//mode/opt //caffe2/test:quantization_pt2e -- --exact 'caffe2/test:quantization_pt2e - test_resnet18_with_quantizer_api (quantization.pt2e.test_quantize_pt2e.TestQuantizePT2EModels)'
Reviewed By: kimishpatel
Differential Revision: D45553195
Pull Request resolved: https://github.com/pytorch/pytorch/pull/101005
Approved by: https://github.com/kimishpatel
