1. add DiverseBranchBlock module;
2. ResNet support dbb version using DiverseBranchBlock by setting micro_block="DiverseBranchBlock";
3. ResNet support official vb version by setting use_first_short_conv=False;
4. add ResNet18_dbb training config ResNet18_dbb.yaml.

the argument may be "infer_add_softmax" used in exporting.

Put the calling of update_res(), stop_after(), freeze_befor() to the construction method of the parent class. And the init_net() support to call stop_after() by config of Arch.

freeze subnet specified with the specified layer name by setting OutputTensor.stop_gradient=True

the error would be raised when when the pattern string represents nested, e.g., containing "[3][1]".

* add AFD

bug is that error rasied by calling update_res() when sublayer does not have _save_sub_res_hook() because nn.Sequential and nn.LayerList is not TheseusLayer.

1. remove WrapLayer and wrap_theseus;
2. support call update_res() one more;
3. optim parse_pattern_str() to return list of layer parsed.

* fix amp bug; update return res method

* support index for list object for return res