Fix: concurrency safe

[jonesyang12]

Refer to this pull request #27。Unexpected errors due to context nesting, concurrency is also not safe。So I deleted the ginI18nImpl. currentContext。Manually pass in the context when calling getMessage。

[appleboy]

I will take it.

[codecov-commenter]

Codecov Report

Merging #32 (d138c3f) into master (f3e2f5e) will decrease coverage by 0.75%.
The diff coverage is 78.57%.

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@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   70.89%   70.14%   -0.75%     
==========================================
  Files           5        5              
  Lines         134      134              
==========================================
- Hits           95       94       -1     
- Misses         31       32       +1     
  Partials        8        8              

Flag	Coverage Δ
go-	70.14% <78.57%> (-0.75%)	⬇️
go-1.14	65.15% <78.57%> (-0.76%)	⬇️
go-1.15	65.15% <78.57%> (-0.76%)	⬇️
go-1.16	70.14% <78.57%> (-0.75%)	⬇️
go-1.17	70.14% <78.57%> (-0.75%)	⬇️
go-1.18	70.14% <78.57%> (-0.75%)	⬇️
go-1.19	70.14% <78.57%> (-0.75%)	⬇️
go-1.20	70.14% <78.57%> (-0.75%)	⬇️
macos-latest	70.14% <78.57%> (-0.75%)	⬇️
ubuntu-latest	70.14% <78.57%> (-0.75%)	⬇️

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Impacted Files	Coverage Δ
i18n.go	88.46% <70.00%> (-3.21%)	⬇️
ginI18n.go	73.17% <100.00%> (-0.64%)	⬇️

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