Create and document how to onboard to the OpenSearch-Build groovy library in a remote repository

[peternied]

Note; this work should not start until all design tasks in #1234 have been completed as they have implications on the acceptance criteria of these tasks.

See example release jenkinsfile workflow from the proof of concept.

Acceptance Criteria:

• Not Defined

[bbarani]

@gaiksaya Can you close this issue if its not valid anymore based on the updated design?

[gaiksaya]

This issue will be needed. I'll close the irrelevant ones from above meta after our design discussion.
Thanks!

[gaiksaya]

Documentation added here: https://github.com/opensearch-project/opensearch-build-libraries#jenkins-shared-libraries