create meta package [RFC] (#13327)

* placeholder

* move setup_tools & abstract about

* adjust lightning-app

* notes

* lightning about

* lightning init

* CI check

* ci

* install

* adjust manifest & mv chlog

* manifest

* pkg

* mv __setup__

* parse_requirements

* lit

* ci - pytorch

* wrap func

* ci

* cd draft

* generate lit

* pkg

* utf-8

* root pkg

* req.

* ver

* mypy

* try check

* meta pkg

* meta pkg - vars

* meta pkg - pruning

* meta pkg - fixing

* fix PL for meta

* multi-line wrapper

* hack manifest

* ci

* fix docstr

* fixing

* ci & mypy

* links