Ensure common-utils can be a drop-in replacement for job-scheduler working in ODFE 1.13 and ES 7.10.x for v1.0.0

[dblock]

Coming from opensearch-plugins#12, enable upgrade to OpenSearch, while supporting backward compatibility.

• Rename Namespaces (e.g. com.amazon.opendistroforelasticsearch to org.opensearch)
• Rename Classes, Methods, Variables
• Rename Remaining Identifiers (e.g. Opendistro to OpenSearch).
• Rename, and Backwards Compatibility for Rest APIs
• Rename, and Backwards Compatibility for Settings
• Rename, and Backwards Compatibility for Indices
• Run in a backwards compatible way on top of OpenSearch 1.0 that has joined an ES 7.10.x cluster
• Run in a backwards compatible way on top of OpenSearch 1.0 that has joined an ODFE 1.13.x cluster
• Drop in replacement for the Opendistro version 1.13 of the plugin

[VachaShah]

Renaming of the namespaces, classes, variables, methods and identifiers is done to reflect OpenSearch. There are some settings and APIs being used from security which need to be updated once security-plugin comes in with the update. I have opened an issue for this: #22.

For the above checklist, the remaining part is the update in CI.yml to required OpenSearch version.

Note: Renaming for Rest APIs, Indices and Settings is not applicable for this repo.

[dblock]

@VachaShah What else needs to be done for this, or can it be closed?

[VachaShah]

@dblock Looks like all the required items are complete for this, it can be closed.