feat(neo-tree): add mapping "O" to open with system default (#2758)

* feat(neo-tree): add mapping "O" to open with system default

* feat(neo-tree): add OS checks for system default open commands

* Use `vim.ui.open` if exists

* update OS checks

* Just use vim.ui.open or throw error if doesn't exist

* Make "O" undefined mapping if vim.ui.open isn't available

* fix: use lazy's util.open instead

---------

Co-authored-by: Uthman Mohamed <83053931+1239uth@users.noreply.github.com>
Co-authored-by: saeedahsan <ahsan02@gmail.com>
Co-authored-by: Folke Lemaitre <folke.lemaitre@gmail.com>

lua/lazyvim/plugins/editor.lua

@@ -67,6 +67,12 @@ return {
             end,
             desc = "copy path to clipboard",
           },
+          ["O"] = {
+            function(state)
+              require("lazy.util").open(state.tree:get_node().path, { system = true })
+            end,
+            desc = "open with system application",
+          },
         },
       },
       default_component_configs = {