C API for TFIDF

[MnO2]

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[codecov]

Codecov Report

Merging #61 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #61   +/-   ##
======================================
  Coverage    86.4%   86.4%           
======================================
  Files           4       4           
  Lines         206     206           
======================================
  Hits          178     178           
  Misses         28      28

Impacted Files	Coverage Δ
capi/src/lib.rs	0% <ø> (ø)	⬆️

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[messense]

On second thought, I think we should expand the API surface of TFIDF C API to allow reusing the TFIDF instance.

• jieba_tfidf_new
• jieba_tfidf_free
• jieba_tfidf_extract