Add feature flag for async query scheduler

[noCharger]

Description

Add feature flag for async query scheduler, which will be passed to Flint to adjust scheduler mode

Also fixed :async-query:jacocoTestCoverageVerification

> Task :async-query:jacocoTestReport
> Task :async-query:jacocoTestCoverageVerification

Check List

• New functionality includes testing.
• New functionality has been documented.
• New functionality has javadoc added.
• New functionality has a user manual doc added.
• Commits are signed per the DCO using --signoff.

Related Issues

opensearch-project/opensearch-spark#622

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For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.47%. Comparing base (6c5c685) to head (ec5627f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2973      +/-   ##
============================================
- Coverage     95.18%   94.47%   -0.71%     
- Complexity     4992     5276     +284     
============================================
  Files           459      519      +60     
  Lines         13532    14973    +1441     
  Branches        905     1001      +96     
============================================
+ Hits          12880    14146    +1266     
- Misses          637      780     +143     
- Partials         15       47      +32     

Flag	Coverage Δ
sql-engine	94.47% <100.00%> (-0.71%)	⬇️

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[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/sql/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/sql/backport-2.x
# Create a new branch
git switch --create backport/backport-2973-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 da622ebd6206b5215f0eceffbbe10218853d6d6d
# Push it to GitHub
git push --set-upstream origin backport/backport-2973-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/sql/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-2973-to-2.x.

[opensearch-trigger-bot]

The backport to 2.17 failed:

The process '/usr/bin/git' failed with exit code 1

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/sql/backport-2.17 2.17
# Navigate to the new working tree
pushd ../.worktrees/sql/backport-2.17
# Create a new branch
git switch --create backport/backport-2973-to-2.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 da622ebd6206b5215f0eceffbbe10218853d6d6d
# Push it to GitHub
git push --set-upstream origin backport/backport-2973-to-2.17
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/sql/backport-2.17

Then, create a pull request where the base branch is 2.17 and the compare/head branch is backport/backport-2973-to-2.17.

[noCharger]

cherry pick on 2.x faild because #2952 is not in 2.x

[opensearch-trigger-bot]

The backport to 2.17 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/sql/backport-2.17 2.17
# Navigate to the new working tree
pushd ../.worktrees/sql/backport-2.17
# Create a new branch
git switch --create backport/backport-2973-to-2.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 da622ebd6206b5215f0eceffbbe10218853d6d6d
# Push it to GitHub
git push --set-upstream origin backport/backport-2973-to-2.17
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/sql/backport-2.17

Then, create a pull request where the base branch is 2.17 and the compare/head branch is backport/backport-2973-to-2.17.