feat: multi selection. Only integrates with send_selected_to_qflist (#551)

This will not yet work with select actions. More work is needed in that case.

Co-authored-by: Simon Hauser <Simon-Hauser@outlook.de>

lua/tests/automated/scroller_spec.lua

@@ -1,5 +1,8 @@
 local p_scroller = require('telescope.pickers.scroller')
 
+local log = require('telescope.log')
+log.use_console = false
+
 local eq = assert.are.same
 
 describe('scroller', function()