feat: layout actions (#1383)

Co-authored-by: johnybx <johnybx@users.noreply.github.com>

lua/telescope/config.lua

@@ -189,6 +189,23 @@ append(
 
 append("layout_config", layout_config_defaults, layout_config_description)
 
+append(
+  "cycle_layout_list",
+  { "horizontal", "vertical", { layout_strategy = "horizontal", previewer = false } },
+  [[
+  Determines the layouts to cycle through when using `actions.cycle_layout_next`
+  and `actions.cycle_layout_prev`.
+  Should be a list of "layout setups".
+  Each "layout setup" can take one of two forms:
+  1. string <br>
+      This is interpreted as the name of a `layout_strategy`
+  2. table <br>
+      A table with possible keys `layout_strategy`, `layout_config` and `previewer`
+
+  Default: TODO
+  ]]
+)
+
 append(
   "winblend",
   0,