Define Nginx Ingress Controller events

[gregkalapos]

Changes

Following the events convention, adding definition for Nginx Ingress Controller events. All this information is from the Elastic Nginx Ingress Controller Logs integration.

Merge requirement checklist

• [x] CONTRIBUTING.md guidelines followed.
• [ ] Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• [ ] schema-next.yaml updated with changes to existing conventions.