feat(pick): move pickers to extras (telescope still the default) (#3606)

## What is this PR for?

Refactoring of pickers in LazyVim:

- [x] telescope moved to extras
- [x] dressing was moved to the telescope extra. Not needed with fzf-lua
and noice
- [x] when none of the two is enabled, then telescope will be enabled
- [x] when using `:LazyExtras` to enable fzf-lua, the telescope spec
will never be parsed
- [x] when not using `:LazyExras`, the spec will be parsed, but one of
the two will be disabled.
- [x] only one picker extra can be used to prevent issues
- [ ] cleanup lsp keymaps

lua/lazyvim/util/init.lua

@@ -32,6 +32,7 @@ local deprecated = {
   toggle_diagnostics = { "toggle", "diagnostics" },
   toggle_number = { "toggle", "number" },
   fg = "ui",
+  telescope = "pick",
 }
 
 setmetatable(M, {
@@ -78,8 +79,10 @@ end
 
 ---@param extra string
 function M.has_extra(extra)
+  local Config = require("lazyvim.config")
   local modname = "lazyvim.plugins.extras." .. extra
   return vim.tbl_contains(require("lazy.core.config").spec.modules, modname)
+    or vim.tbl_contains(Config.json.data.extras, modname)
 end
 
 ---@param fn fun()