Split Platform into sub-packages

[droshev]

Is this a bug, enhancement, or feature request?

enhancement

Briefly describe your proposal.

Split core library into multiple sub-packages - similar like #5453

• Libraries should be built with nx instead of ng;
• All main platform modules are now built as separate sub-packages
• each library should contain own tsconfig.json file with strict mode disabled, and can be enabled on per-package basis;