feat: add light java sdk

[dl239]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (5e225da) 40.16% compared to head (7ad6ea1) 40.16%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
...java/com/_4paradigm/openmldb/sdk/SqlException.java	0.00%	4 Missing ⚠️
...paradigm/openmldb/sdk/impl/SqlClusterExecutor.java	63.63%	3 Missing and 1 partial ⚠️
.../com/_4paradigm/openmldb/spark/OpenmldbSource.java	0.00%	1 Missing ⚠️
...openmldb/spark/write/OpenmldbDataSingleWriter.java	0.00%	1 Missing ⚠️
...adigm/openmldb/spark/write/OpenmldbDataWriter.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3642      +/-   ##
============================================
- Coverage     40.16%   40.16%   -0.01%     
- Complexity      640      642       +2     
============================================
  Files           191      191              
  Lines         11233    11244      +11     
  Branches       1325     1326       +1     
============================================
+ Hits           4512     4516       +4     
- Misses         6428     6435       +7     
  Partials        293      293              

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[tobegit3hub]

LGTM