support spark3.x for connector

[Nicole00]

close #20

[xianjingfeng]

Gentle ping @Nicole00 . Will you continue?

[Nicole00]

Gentle ping @Nicole00 . Will you continue?

Yeah， of course, I'll resolve the compile problem and merge it.

[codecov-commenter]

Codecov Report

Base: 44.67% // Head: 31.29% // Decreases project coverage by -13.39% ⚠️

Coverage data is based on head (9628e33) compared to base (305f980).
Patch coverage: 25.99% of modified lines in pull request are covered.

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Additional details and impacted files

@@              Coverage Diff              @@
##             master      #71       +/-   ##
=============================================
- Coverage     44.67%   31.29%   -13.39%     
+ Complexity      123       78       -45     
=============================================
  Files            30       30               
  Lines          1672     1518      -154     
  Branches        280      239       -41     
=============================================
- Hits            747      475      -272     
- Misses          846      973      +127     
+ Partials         79       70        -9     

Impacted Files	Coverage Δ
...la/com/vesoft/nebula/connector/NebulaOptions.scala	0.00% <0.00%> (ø)
...cala/com/vesoft/nebula/connector/NebulaUtils.scala	38.31% <0.00%> (-21.39%)	⬇️
.../vesoft/nebula/connector/reader/NebulaReader.scala	0.00% <0.00%> (ø)
...t/nebula/connector/reader/NebulaSourceReader.scala	64.00% <33.33%> (-21.72%)	⬇️
...om/vesoft/nebula/connector/utils/Validations.scala	50.00% <50.00%> (ø)
...esoft/nebula/connector/reader/NebulaRelation.scala	60.00% <57.14%> (-27.50%)	⬇️
.../nebula/connector/writer/NebulaWriterBuilder.scala	69.04% <69.04%> (ø)
...ft/nebula/connector/reader/SimpleScanBuilder.scala	80.00% <80.00%> (ø)
...esoft/nebula/connector/reader/NebulaIterator.scala	100.00% <100.00%> (+25.00%)	⬆️
...com/vesoft/nebula/connector/reader/NebulaRDD.scala	95.00% <100.00%> (ø)
... and 15 more

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[wey-gu]

Cheers!!!!!