Investigate git submodules / other design patterns that support modular feature design

[leelalagudu]

This issue is to investigate the feasibility of git submodules/similar mechanisms to breakdown the current mono repo into a more manageable modular repo. At the moment, the solution supports the following features all under a single monorepo:

• Composite permission sets & enterprise friendly account assignments
• Region switch
• Import current configuraiton The solution has the following features that are being developed/in pipeline:
• Org main account switch
• Privileged access management

Without a well defined modular repo structure, the solution would soon transform into a monolith increasing the risk of regression and ops burden.

AC:

• Design and document a architecture decision record(ADR) for the modular system proposed
• Refactor the solution as well as the self-mutating pipeline to fit into this system