Add OpenAPI specification for bulk create and bulk update saved object APIs

[BionIT]

Description

This change adds OpenAPI specification for bulk create and bulk update saved object APIs.

Issues Resolved

Related to #6719

Screenshot

bulk create

bulk update

Testing the changes

run npx serve and verify the api via swagger UI

Changelog

• doc: Add OpenAPI specification for bulk create and bulk update saved object APIs

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.38%. Comparing base (026dd38) to head (cb5dc73).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6859   +/-   ##
=======================================
  Coverage   67.38%   67.38%           
=======================================
  Files        3443     3443           
  Lines       67797    67797           
  Branches    11033    11033           
=======================================
+ Hits        45683    45688    +5     
+ Misses      19443    19440    -3     
+ Partials     2671     2669    -2     

Flag	Coverage Δ
Linux_1	33.07% <ø> (ø)
Linux_2	55.12% <ø> (ø)
Linux_3	45.18% <ø> (?)
Linux_4	34.82% <ø> (?)
Windows_1	33.09% <ø> (ø)
Windows_2	55.09% <ø> (ø)
Windows_3	45.19% <ø> (ø)
Windows_4	34.82% <ø> (ø)

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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/OpenSearch-Dashboards/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch-Dashboards/backport-2.x
# Create a new branch
git switch --create backport/backport-6859-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 cf4e496aa03d12b18244f271185863f5fbf1ff6d
# Push it to GitHub
git push --set-upstream origin backport/backport-6859-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch-Dashboards/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-6859-to-2.x.