feat: config.Duration implement TextMarshaller (close #164)

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[codecov]

Codecov Report

Merging #166 (42644dc) into master (b6f2d0a) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 42644dc differs from pull request most recent head 00504a7. Consider uploading reports for the commit 00504a7 to get more accurate results

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
+ Coverage   80.42%   80.45%   +0.02%     
==========================================
  Files          89       89              
  Lines        3224     3228       +4     
==========================================
+ Hits         2593     2597       +4     
  Misses        460      460              
  Partials      171      171              

Impacted Files	Coverage Δ
config/time.go	76.00% <100.00%> (+4.57%)	⬆️

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