Implementation of static file handler

[dongxuny]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 67.34694% with 64 lines in your changes missing coverage. Please review.

Project coverage is 83.42%. Comparing base (3b4f4cb) to head (e198768).
Report is 157 commits behind head on master.

Files with missing lines	Patch %	Lines
boot/static_file_handler_entry.go	74.85%	33 Missing and 9 partials ⚠️
boot/grpc_entry.go	24.13%	18 Missing and 4 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
- Coverage   84.27%   83.42%   -0.85%     
==========================================
  Files          38       39       +1     
  Lines        3713     3909     +196     
==========================================
+ Hits         3129     3261     +132     
- Misses        456      507      +51     
- Partials      128      141      +13     

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