Include sortText in completions and improve suggestions (#2332)

* sort completions

* add an example

* Include fuzzy scores in completions sort text

* hlints

* Extend completion documentation to inform whether an identifier is alreaady imported

* Ditch alphabetical ordering - it's incompatible with qualified completions

* Fix bugs in completion help text

This fixes the ugly "Imported from 'Just B'" and other inconsistencies

* added tests for qualified completions

* Fix redundant import

* Inline Fuzzy.match to apply [1] and to be case-sensitive on first match

[1] - https://github.com/joom/fuzzy/pull/4



* fixup! Fix bugs in completion help text

* Sort qualified completions first

* Filter out global suggestions that overlap with local

For example, don't suggest GHC.Exts.fromList when Data.Map.fromList is in scope alraedy

* Sort completions alphabetically

* Show provenance in detail text

* Sort local/in-scope completions first

* Fix build with GHC 9

* Ignore func symbol tests

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