feat: Action improvements (#472)

* feat: replace_map

* feat: Add action_set and action_state

* fix: Move all actions.get_ to action_state.get_

* fix: replace all internal references of _goto_file_selection_edit

* feat: add some docs

* fix: lint

* feat: actions.select

* remove mentions and usage of goto_file_selection APIs

* feat: special case attach_mappings to be overridable and defaultable

* Having goto_file_selection mappings will cause a error

as well as replacing deprecated goto_file_selection methodes

For config and replacing use this instead:
- actions.select_default
- actions.select_horizonal
- actions.select_vertical
- actions.select_tab

Only replacing:
- actions.set.edit -- for replacing all select functions

* adds actions.state.select_key_to_edit_key

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

lua/telescope/builtin/files.lua

@@ -1,4 +1,5 @@
-local actions = require('telescope.actions')
+local action_state = require('telescope.actions.state')
+local action_set = require('telescope.actions.set')
 local finders = require('telescope.finders')
 local make_entry = require('telescope.make_entry')
 local pickers = require('telescope.pickers')
@@ -256,9 +257,9 @@ files.current_buffer_fuzzy_find = function(opts)
     },
     sorter = conf.generic_sorter(opts),
     attach_mappings = function()
-      actions._goto_file_selection:enhance {
+      action_set.select:enhance {
         post = function()
-          local selection = actions.get_selected_entry()
+          local selection = action_state.get_selected_entry()
           vim.api.nvim_win_set_cursor(0, {selection.lnum, 0})
         end,
       }
@@ -292,9 +293,9 @@ files.tags = function(opts)
     previewer = previewers.ctags.new(opts),
     sorter = conf.generic_sorter(opts),
     attach_mappings = function()
-      actions._goto_file_selection:enhance {
+      action_set.select:enhance {
         post = function()
-          local selection = actions.get_selected_entry()
+          local selection = action_set.get_selected_entry()
 
           if selection.scode then
             local scode = string.gsub(selection.scode, '[$]$', '')