Split API codebase into Core and light API

[arhimede]

Feature Request

Q	A
New Feature	yes

Summary

Step by step architecture about how to split Dotkernel API into CORE and light API
In order to reuse the CORE into other projects ( frontends, admins, etc)

[arhimede]

API monolith ==> CORE + Light API

admin monolith ==> CORE + Light Admin

messenger service ==> CORE + custom code swoole

frontend ==> CORE + light frontend

CORE 1 -> db1
CORE 2 -> db2
CORE 3 -> redis

[arhimede]

https://www.atlassian.com/git/tutorials/git-subtree TBD