feat(dict): implement uhash loader and migrator

[kanru]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.47368% with 24 lines in your changes are missing coverage. Please review.

Project coverage is 84.38%. Comparing base (acd5bff) to head (c94ba0e).

Files	Patch %	Lines
src/dictionary/cdb.rs	0.00%	12 Missing :warning:
src/dictionary/kv.rs	0.00%	7 Missing :warning:
src/dictionary/uhash.rs	97.84%	3 Missing :warning:
src/dictionary/loader.rs	97.05%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #434      +/-   ##
==========================================
+ Coverage   79.69%   84.38%   +4.69%     
==========================================
  Files          61       62       +1     
  Lines       11466    12976    +1510     
==========================================
+ Hits         9138    10950    +1812     
+ Misses       2328     2026     -302     

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