[RFC] Stage 0: Introducing new fields in ECS vulnerability field set

[smriti0321]

RFC to add new fields in ECS vulnerability field set

• Have you signed the contributor license agreement?Yes
• Have you followed the contributor guidelines?Yes
• For proposing substantial changes or additions to the schema, have you reviewed the RFC process?Yes
• If submitting code/script changes, have you verified all tests pass locally using make test?
• If submitting schema/fields updates, have you generated new artifacts by running make and committed those changes?
• Is your pull request against main? Unless there is a good reason otherwise, we prefer pull requests against main and will backport as needed.
• Have you added an entry to the CHANGELOG.next.md?