Add spotless for formatting Java source files

[mulugetam]

Description

1. Adds spotless for Java code formatting ( ./gradlew spotlessJavaCheck).
2. Formats existing code.
3. Updates the deprecated gradle construct plugins.withId('java').

Issues Resolved

Resolves inconsistent code formatting.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[reta]

@mulugetam we probably need to exclude some binary files (as GA checks fail), thank you.

[mulerm]

@reta Looks to me that ./gradlew check failed because spotless was not applied to files in the .github directory. It should pass now. Not sure what binary files we should exclude.

[reta]

@reta Looks to me that ./gradlew check failed because spotless was not applied to files in the .github directory. It should pass now. Not sure what binary files we should exclude.

Oh I see, thanks @mulugetam , I just briefly looked into failure I thought there are some attempts to format binary files, non issue

[mulugetam]

@reta Fixed. Please review.

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/custom-codecs/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/custom-codecs/backport-2.x
# Create a new branch
git switch --create backport/backport-120-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 27e925c183f4c2f5c550204e2eedd2caab7b9811
# Push it to GitHub
git push --set-upstream origin backport/backport-120-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/custom-codecs/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-120-to-2.x.

[reta]

@mulugetam could you please apply backport to 2.x manually? Thank you