[Offline Nodes] Add a new library containing required abstractions to run Offline Background Tasks

[linuxpi]

Is your feature request related to a problem? Please describe

As proposed in https://github.com/opensearch-project/OpenSearch/issues/13554, we need various interfaces to build components required to run background tasks on offline nodes

Describe the solution you'd like

Introduce a new library which hosts all the interfaces needed for building components for offline background tasks

Related component

Storage

Describe alternatives you've considered

No response

Additional context

No response