Move pragmas completion to pragmas plugin (#2134)

* Move pragmas completion to pragmas plugin

* update pragmas plugin tests

* move options pragmas to pragmas plugin

return empty list from logic completions when opts or pragma start

fix empty list logic

Co-authored-by: Alex Naspo <alex.naspo@leapyear.io>
Co-authored-by: Javier Neira <atreyu.bbb@gmail.com>