reduce the package size

[Nicole00]

close #43
Use the connector jar in spark-shell:

spark-shell --jars nebula-spark-connector-3.0-SNAPSHOT-jar-with-dependencies.jar

[codecov-commenter]

Codecov Report

Base: 50.72% // Head: 50.72% // No change to project coverage 👍

Coverage data is based on head (4c8a741) compared to base (cab62fa).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #68   +/-   ##
=========================================
  Coverage     50.72%   50.72%           
  Complexity      122      122           
=========================================
  Files            26       26           
  Lines          1451     1451           
  Branches        240      240           
=========================================
  Hits            736      736           
  Misses          639      639           
  Partials         76       76           

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[HarrisChu]

LGTM