Update build script to build JNI lib and gradlew assemble

[naveentatikonda]

Signed-off-by: Naveen [email protected]

Description

Update build script to build JNI libraries separately and then do gradle assemble instead of gradle build

Check List

• All tests pass
• Commits are signed as per the DCO using --signoff

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[codecov-commenter]

Codecov Report

Merging #659 (6cca564) into 1.3 (b6f89a1) will increase coverage by 0.36%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                1.3     #659      +/-   ##
============================================
+ Coverage     83.91%   84.27%   +0.36%     
- Complexity      895      901       +6     
============================================
  Files           127      127              
  Lines          3867     3867              
  Branches        358      358              
============================================
+ Hits           3245     3259      +14     
+ Misses          463      451      -12     
+ Partials        159      157       -2     

Impacted Files	Coverage Δ
...ain/java/org/opensearch/knn/index/KNNSettings.java	83.08% <0.00%> (+2.20%)	⬆️
...org/opensearch/knn/training/TrainingJobRunner.java	53.73% <0.00%> (+4.47%)	⬆️
...va/org/opensearch/knn/index/KNNCircuitBreaker.java	80.00% <0.00%> (+20.00%)	⬆️

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