[FEATURE] Automate and standardize generation of release notes

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Is your feature request related to a problem?

• Every plugin generates release notes in their own way, and either by hand or with semi-automation.
• In version 1.2.2 the combined release notes for the OpenSearch product were largely incomplete, missing most plugins that did increment the log4j dependency, see https://github.com/opensearch-project/opensearch-build/blob/main/release-notes/opensearch-release-notes-1.2.2.md.

What solution would you like?

1. A release notes file is created and committed to the plugin repo every time a version is incremented.
2. Release notes are automatically updated every time a change is made before a release or once after feature complete.
3. Release notes are kept up-to-date with changes and can be verified as complete.

Do you have any additional context?

• Some plugins have a create_release_notes.py checked in, e.g. https://github.com/opensearch-project/common-utils/blob/main/release-notes/create_release_notes.py. Can't tell how to use this.
• this is how security plugin does it