support ssl for spark connector

[Nicole00]

No description provided.

[codecov-commenter]

Codecov Report

Merging #18 (81ee547) into master (3124ea9) will decrease coverage by 2.47%.
The diff coverage is 53.37%.

@@             Coverage Diff              @@
##             master      #18      +/-   ##
============================================
- Coverage     76.49%   74.02%   -2.48%     
- Complexity      151      152       +1     
============================================
  Files            22       24       +2     
  Lines          1468     1567      +99     
  Branches        228      247      +19     
============================================
+ Hits           1123     1160      +37     
- Misses          206      264      +58     
- Partials        139      143       +4     

Impacted Files	Coverage Δ
...scala/com/vesoft/nebula/connector/NebulaEnum.scala	100.00% <ø> (ø)
...om/vesoft/nebula/connector/ssl/SSLSignParams.scala	0.00% <0.00%> (ø)
...vesoft/nebula/connector/nebula/GraphProvider.scala	52.38% <21.42%> (-11.26%)	⬇️
.../vesoft/nebula/connector/nebula/MetaProvider.scala	66.03% <23.52%> (-23.16%)	⬇️
...in/scala/com/vesoft/nebula/connector/package.scala	59.25% <36.36%> (-8.72%)	⬇️
...ebula/connector/reader/NebulaPartitionReader.scala	74.39% <36.66%> (-22.11%)	⬇️
...ala/com/vesoft/nebula/connector/NebulaConfig.scala	79.15% <61.90%> (+2.36%)	⬆️
...la/com/vesoft/nebula/connector/NebulaOptions.scala	85.05% <90.90%> (+0.35%)	⬆️
...t/nebula/connector/reader/NebulaSourceReader.scala	93.10% <100.00%> (+0.65%)	⬆️
...cala/com/vesoft/nebula/connector/ssl/SSLEnum.scala	100.00% <100.00%> (ø)
... and 3 more

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