add edge reader by ngql

[MeeCreeps]

Read subgraph edge data via ngql as input to the nebula-algorithm side

[CLAassistant]

All committers have signed the CLA.

[Nicole00]

Thanks for your idea and pr.
Connector uses java storage client and uses Scan interface to read NebulaGraph's data. The Scan interface has one param named filter, which would resolve your requirement. But sadly this filter param is not implemented yet.
And I thank your pr maybe a business solution, can you push it to branch community_ngql?

[MeeCreeps]

ok,thanks for your reply, I will push it to bash comunity_ngql
and could you please tell me about the filter ?

[Nicole00]

could you please resolve the conflict?

[codecov-commenter]

Codecov Report

Merging #57 (20f0a8d) into community_ngql (ecdf065) will decrease coverage by 5.50%.
The diff coverage is 12.75%.

@@                 Coverage Diff                  @@
##             community_ngql      #57      +/-   ##
====================================================
- Coverage             73.86%   68.35%   -5.51%     
- Complexity              152      153       +1     
====================================================
  Files                    24       25       +1     
  Lines                  1580     1716     +136     
  Branches                255      278      +23     
====================================================
+ Hits                   1167     1173       +6     
- Misses                  266      395     +129     
- Partials                147      148       +1     

Impacted Files	Coverage Δ
...in/scala/com/vesoft/nebula/connector/package.scala	52.09% <0.00%> (-7.17%)	⬇️
...nnector/reader/NebulaNgqlEdgePartitionReader.scala	0.00% <0.00%> (ø)
...soft/nebula/connector/reader/NebulaPartition.scala	66.66% <0.00%> (-33.34%)	⬇️
...t/nebula/connector/reader/NebulaSourceReader.scala	85.71% <0.00%> (-7.39%)	⬇️
...ala/com/vesoft/nebula/connector/NebulaConfig.scala	76.06% <55.17%> (-2.74%)	⬇️
...la/com/vesoft/nebula/connector/NebulaOptions.scala	85.31% <100.00%> (+0.25%)	⬆️

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[MeeCreeps]

hi,I resolve the conflict , could you review it