feat(dict): Automatically load extra dictionaries found in search path

[kanru]

Fixes #184

[codecov]

Codecov Report

Attention: Patch coverage is 94.87179% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.77%. Comparing base (2a23796) to head (2ea6f5b).

Files	Patch %	Lines
src/path.rs	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #612      +/-   ##
==========================================
+ Coverage   89.71%   89.77%   +0.05%     
==========================================
  Files          42       42              
  Lines        8723     8759      +36     
==========================================
+ Hits         7826     7863      +37     
+ Misses        897      896       -1     

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