[x] Commits are signed per the DCO using --signoff
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Description
Add DCO, link checker, backport, draft release notes, pull request template and other workflows
Issues Resolved
https://github.com/opensearch-project/logstash-input-opensearch/issues/3
Check List
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.