Prolog: new parser

[masatake]

Close #2628.

• [ ] improve the test coverage

[codecov[bot]]

Codecov Report

:x: Patch coverage is 94.86486% with 19 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 85.98%. Comparing base (876e82a) to head (c99c2f4). :warning: Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
parsers/prolog.c	96.81%	10 Missing :warning:
main/tokeninfo.c	66.66%	9 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4249      +/-   ##
==========================================
+ Coverage   85.92%   85.98%   +0.06%     
==========================================
  Files         248      249       +1     
  Lines       63733    64102     +369     
==========================================
+ Hits        54765    55121     +356     
- Misses       8968     8981      +13     

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