log: make NewBufferLogger safe to read/write across goroutines

[adamdecaf]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 76.47% and project coverage change: -0.09 ⚠️

Comparison is base (ad25204) 76.17% compared to head (42b117a) 76.08%.

❗ Current head 42b117a differs from pull request most recent head 5cd563b. Consider uploading reports for the commit 5cd563b to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
- Coverage   76.17%   76.08%   -0.09%     
==========================================
  Files          28       28              
  Lines         999     1012      +13     
==========================================
+ Hits          761      770       +9     
- Misses        175      179       +4     
  Partials       63       63              

Impacted Files	Coverage Δ
log/logger_impl.go	86.77% <76.47%> (-2.12%)	⬇️

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