g3-openssl: add a standalone SslError type

[zh-jq-b]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 20.83333% with 19 lines in your changes missing coverage. Please review.

Project coverage is 55.13%. Comparing base (ee25ed3) to head (af1d068).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/g3-openssl/src/ssl/error.rs	22.22%	14 Missing ⚠️
lib/g3-openssl/src/ssl/stream.rs	33.33%	2 Missing ⚠️
lib/g3-openssl/src/ssl/accept.rs	0.00%	1 Missing ⚠️
lib/g3-openssl/src/ssl/connect.rs	0.00%	1 Missing ⚠️
lib/g3-openssl/src/ssl/lazy_accept.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #659      +/-   ##
==========================================
+ Coverage   54.95%   55.13%   +0.18%     
==========================================
  Files        1192     1193       +1     
  Lines      110987   111005      +18     
==========================================
+ Hits        60991    61204     +213     
+ Misses      49996    49801     -195     

Flag	Coverage Δ
g3bench	33.52% <0.00%> (-0.02%)	⬇️
g3proxy	54.00% <20.83%> (+0.19%)	⬆️
lib	25.86% <0.00%> (-0.01%)	⬇️

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