Break code base out into multi java modules

[Nana-EC]

Goal

Ensure an appropriate balance of block node logic encapsulation and decoupling to ensure support for future customized implementations of core block node features as well as better testing and explicit service management

Intention

Update the block node code to support java modules with clear goals for each modules.

Initial module split

• base (temporary module to encompass current logic and allow parallel development)
• server (this is just the top-level "start the server" code)
• validation
• validation-api
• persistence
• persistence-api

Considerations

• gradle builds
• nano service architecture

Technical Details

No response

Tasks and Features

No response