Normalize import format

[Connor1996]

Normalize import format by the rule which is used by TiKV

[Connor1996]

PTAL as well @LykxSassinator

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 99.00990% with 2 lines in your changes missing coverage. Please review.

Project coverage is 98.22%. Comparing base (fa56f89) to head (eeb3a35). Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
src/engine.rs	97.22%	1 Missing :warning:
src/filter.rs	50.00%	1 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #339   +/-   ##
=======================================
  Coverage   98.21%   98.22%           
=======================================
  Files          33       33           
  Lines       12446    12501   +55     
=======================================
+ Hits        12224    12279   +55     
  Misses        222      222           

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