* Refactor ModelEstimator:
1. add EvaluatorLoop in engine.runners;
2. add estimator for structures (both subnet & supernet);
3. add layer_counter for each op.
* fix lint
* update estimator:
1. add ResourceEstimator based on BaseEstimator;
2. add notes & examples for ResourceEstimator & EvaluatorLoop usage;
3. fix a bug of latency test.
4. minor changes according to comments.
* add UT & fix a bug caused by UT
* add docstrings & remove old estimator
* update docstrings for op_spec_counters
* rename resource_evaluator_val_loop
* support adding resource attrs of each submodule in a measured model
* fix lint
* refactor estimator file structures
* support estimating resources for spec modules
* rm old UT
* update new estimator UT cases
* fix traversal range of the model
* cancel unit convert in accumulate_sub_module_flops_params
* use estimator_cfg to build ResourceEstimator
* fix a broadcast bug
* delete fixed input_shape
* add assertion and string-format-return when measuring spec_modules
* add UT for estimating spec_modules
