[FEATURE] Add checkstyle support in repo

[TrungBui59]

Description

Adding spotless support for the repo

Issues Resolved

#1591

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Attention: Patch coverage is 61.16751% with 153 lines in your changes missing coverage. Please review.

Project coverage is 80.75%. Comparing base (5759bf2) to head (8dbd68e).
Report is 431 commits behind head on main.

Files with missing lines	Patch %	Lines
...va/org/opensearch/ml/common/input/InputHelper.java	0.00%	33 Missing ⚠️
...src/main/java/org/opensearch/ml/common/MLTask.java	0.00%	17 Missing ⚠️
...opensearch/ml/common/conversation/Interaction.java	0.00%	15 Missing ⚠️
...earch/ml/common/conversation/ConversationMeta.java	0.00%	10 Missing ⚠️
...ensearch/ml/common/exception/ExecuteException.java	0.00%	6 Missing ⚠️
...n/java/org/opensearch/ml/common/dataframe/Row.java	61.53%	2 Missing and 3 partials ⚠️
...execute/metrics_correlation/MCorrModelTensors.java	16.66%	5 Missing ⚠️
...org/opensearch/ml/common/MLCommonsClassLoader.java	57.14%	3 Missing ⚠️
...g/opensearch/ml/common/connector/AwsConnector.java	40.00%	0 Missing and 3 partials ⚠️
...org/opensearch/ml/common/dataframe/ColumnType.java	57.14%	0 Missing and 3 partials ⚠️
... and 41 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1676      +/-   ##
============================================
+ Coverage     79.67%   80.75%   +1.08%     
- Complexity     4020     4187     +167     
============================================
  Files           394      399       +5     
  Lines         16385    16879     +494     
  Branches       1754     1819      +65     
============================================
+ Hits          13055    13631     +576     
+ Misses         2654     2534     -120     
- Partials        676      714      +38     

Flag	Coverage Δ
ml-commons	80.75% <61.16%> (+1.08%)	⬆️

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[dhrubo-os]

Let's not add this in the whole repo. Let's add in the sub modules where it's missing.

[TrungBui59]

But it is the same for every submodules, so is it make more sense to at it to the whole repo

[dhrubo-os]

@ylwu-amzn do you have any suggestion here?

[ylwu-amzn]

I'm ok for this as this will be applied to all modules. But feel free to comment if you have concerns

[dhrubo-os]

@TrungBui59 Could you please resolve the merge conflicts?

[mingshl]

spotless is added, closing PR