Add overlay for deep object in security APIs

[lcawl]

This PR adds the x-model extension for the role template query schema in the role APIs, since it is too deep to display well at this time. It also adds a link to https://www.elastic.co/guide/en/elasticsearch/reference/master/field-and-document-access-control.html#templating-role-query

[szabosteve]

LGTM!

[github-actions]

The backport to 8.x failed:

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

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.x 8.x
# Navigate to the new working tree
cd .worktrees/backport-8.x
# Create a new branch
git switch --create backport-2914-to-8.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 e7547bb90da03348df819aeb1812af0b16b577da
# Push it to GitHub
git push --set-upstream origin backport-2914-to-8.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.x

Then, create a pull request where the base branch is 8.x and the compare/head branch is backport-2914-to-8.x.