[slim] Add quantization strategy and distillation strategy. (#16408)
* Add fsp operator.
1 Add unitest.
2. Add python API.
3. Add layer test.
* Add quantization strategy.
1. Add API.
2. Add unitest.
* Add distillatoin strategy.
* Add unitest config file for quantization
* Fix Copyright
test=develop
* Fix setup.py
* Fix document of layers.py.
test=develop
* Fix unitest in python3.
test=develop
* Fix documents.
test=develop
* 1. refine fsp op by batched gemm
2. remove unused import
test=develop
* Fix test_dist_se_resnext.
1. disable test distillation.
2. reset framework.py
test=develop
* Enable unitest of distillation after fixing Block._clone_variable
test=develop
* Fix cdn issue.
test=develop
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