Pipeline interface refactor

[gpengzhi]

resolve #125

[codecov]

Codecov Report

Merging #140 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
+ Coverage   69.98%   70.04%   +0.06%     
==========================================
  Files         112      112              
  Lines        7549     7561      +12     
==========================================
+ Hits         5283     5296      +13     
+ Misses       2266     2265       -1

Impacted Files	Coverage Δ
...rte/processors/base/tests/dummy_batch_processor.py	98.64% <ø> (ø)	⬆️
forte/processors/spacy_processors.py	92.98% <ø> (ø)	⬆️
forte/processors/nltk_processors.py	100% <ø> (ø)	⬆️
forte/processors/tests/nltk_processors_test.py	99.05% <100%> (ø)	⬆️
forte/__init__.py	100% <100%> (ø)	⬆️
...rocessors/base/tests/dummy_batch_processor_test.py	98.21% <100%> (ø)	⬆️
forte/base_pipeline.py	89.67% <100%> (+0.45%)	⬆️
...ta/readers/tests/multipack_sentence_reader_test.py	97.36% <100%> (ø)	⬆️
forte/data/readers/base_reader.py	88.65% <100%> (+0.23%)	⬆️
forte/processors/base/base_processor.py	96.87% <100%> (+2.58%)	⬆️
... and 5 more

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[hunterhector]

OK