feat(client): support edgeExistence api

[msgui]

Purpose of the PR

• follow feat: optimising adjacency edge queries incubator-hugegraph#2242

Main Changes

• support edgeexistence api

Verifying these changes

• Trivial rework / code cleanup without any test coverage. (No Need)
• Already covered by existing tests, such as (please modify tests here).
• Need tests and can be verified as follows:
  • xxx

Does this PR potentially affect the following parts?

• Nope
• Dependencies (add/update license info)
• Modify configurations
• The public API
• Other affects (typed here)

Documentation Status

• Doc - TODO
• Doc - Done
• Doc - No Need

[msgui]

I've run into a challenging error, seemingly caused by errors related to the 'COMMIT_ID', resulting in GitHub CI not running smoothly.
fatal: reference is not a tree: be6ee386b9939dc6bd6fcbdf2274b8acc3a0a314

[imbajin]

I've run into a challenging error, seemingly caused by errors related to the 'COMMIT_ID', resulting in GitHub CI not running smoothly. fatal: reference is not a tree: be6ee386b9939dc6bd6fcbdf2274b8acc3a0a314

refer #542 (comment)

[codecov]

Codecov Report

Attention: 69 lines in your changes are missing coverage. Please review.

Comparison is base (b066b80) 62.49% compared to head (a639a1b) 62.55%.
Report is 8 commits behind head on master.

Files	Patch %	Lines
.../apache/hugegraph/structure/traverser/VESteps.java	53.48%	20 Missing ⚠️
...ugegraph/structure/traverser/KneighborRequest.java	66.66%	4 Missing ⚠️
...che/hugegraph/structure/traverser/KoutRequest.java	69.23%	4 Missing ⚠️
.../org/apache/hugegraph/driver/TraverserManager.java	25.00%	3 Missing ⚠️
...ache/hugegraph/structure/traverser/ApiMeasure.java	25.00%	3 Missing ⚠️
...g/apache/hugegraph/structure/traverser/VEStep.java	80.00%	3 Missing ⚠️
...n/java/org/apache/hugegraph/driver/HugeClient.java	33.33%	2 Missing ⚠️
...egraph/structure/traverser/CrosspointsRequest.java	60.00%	2 Missing ⚠️
...aph/structure/traverser/CustomizedCrosspoints.java	0.00%	2 Missing ⚠️
...gegraph/structure/traverser/JaccardSimilarity.java	66.66%	2 Missing ⚠️
... and 17 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #544      +/-   ##
============================================
+ Coverage     62.49%   62.55%   +0.05%     
- Complexity     1903     1923      +20     
============================================
  Files           262      267       +5     
  Lines          9541     9677     +136     
  Branches        886      888       +2     
============================================
+ Hits           5963     6053      +90     
- Misses         3190     3235      +45     
- Partials        388      389       +1     

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[msgui]

apache/incubator-hugegraph#2380 After merging, continue.

[imbajin]

merge after #550