support ssl for graph

[Nicole00]

No description provided.

[codecov-commenter]

Codecov Report

Merging #30 (02f7c1c) into master (50b1bf6) will increase coverage by 2.31%.
The diff coverage is 81.13%.

@@             Coverage Diff              @@
##             master      #30      +/-   ##
============================================
+ Coverage     38.12%   40.43%   +2.31%     
- Complexity      135      142       +7     
============================================
  Files            45       46       +1     
  Lines          1314     1365      +51     
  Branches        117      124       +7     
============================================
+ Hits            501      552      +51     
+ Misses          769      765       -4     
- Partials         44       48       +4     

Impacted Files	Coverage Δ
...bula/connection/NebulaGraphConnectionProvider.java	76.92% <63.63%> (-10.58%)	⬇️
...nnector/nebula/connection/NebulaClientOptions.java	89.04% <83.33%> (+20.62%)	⬆️
...ache.flink/connector/nebula/utils/SslSighType.java	100.00% <100.00%> (ø)

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