feat: add cursor layout (#878)

* Add basic implementation of "cursor" layout strategy

* Update cursor layout strategy to properly follow cursor

* feat(cursor_layout): handle previewer

* Refactor cursor layout code

* Add cursor theme

* Update readme

* Improve cursor theme and layout documentation

* [docgen] Update doc/telescope.txt
skip-checks: true

* Remove trailing whitespace

* Fix issues related with neovim and plugin api changes

* [docgen] Update doc/telescope.txt
skip-checks: true

* Allow preview width to be configured

* [docgen] Update doc/telescope.txt
skip-checks: true

Co-authored-by: Github Actions <actions@github>
Co-authored-by: cbrunel <cbrunel@sogescom.local>

lua/telescope/config.lua

@@ -80,6 +80,10 @@ local layout_config_defaults = {
   center = {
     preview_cutoff = 40,
   },
+
+  cursor = {
+    preview_cutoff = 40,
+  }
 }
 
 local layout_config_description = string.format([[