feature: suport TLS Authentication for etcd

[igotcha]

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[codecov-commenter]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (1d099ab) 73.62% compared to head (e24253f) 73.19%.
Report is 1 commits behind head on master.

❗ Current head e24253f differs from pull request most recent head ace4a21. Consider uploading reports for the commit ace4a21 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
- Coverage   73.62%   73.19%   -0.43%     
==========================================
  Files          51       51              
  Lines        4959     5007      +48     
==========================================
+ Hits         3651     3665      +14     
- Misses       1075     1109      +34     
  Partials      233      233              

Files	Coverage Δ
database/kv/etcd/v3/options.go	63.15% <0.00%> (-36.85%)	⬇️
database/kv/etcd/v3/client.go	60.26% <78.57%> (-4.11%)	⬇️

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