feat: support ssl

[veezhang]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

#295

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

[codecov-commenter]

Codecov Report

Attention: 27 lines in your changes are missing coverage. Please review.

Comparison is base (1cbec84) 87.89% compared to head (b60aa41) 87.37%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #294      +/-   ##
==========================================
- Coverage   87.89%   87.37%   -0.52%     
==========================================
  Files          79       79              
  Lines        3857     3906      +49     
==========================================
+ Hits         3390     3413      +23     
- Misses        458      482      +24     
- Partials        9       11       +2     

Files	Coverage Δ
pkg/client/option.go	100.00% <100.00%> (ø)
pkg/client/session_v3.go	100.00% <100.00%> (ø)
pkg/config/base/log.go	100.00% <100.00%> (ø)
pkg/config/v3/config.go	86.36% <0.00%> (-4.12%)	⬇️
pkg/config/base/client.go	62.90% <43.90%> (-37.10%)	⬇️

... and 1 file with indirect coverage changes

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[kqzh]

LGTM