vim: Implement named registers (#12895)

Release Notes:

- vim: Add support for register selection `"a`-`"z`, `"0`-`"9`, `"-`.
`"_` and `"%`
([#11511](https://github.com/zed-industries/zed/issues/11511))

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

assets/keymaps/vim.json

@@ -385,6 +385,7 @@
       "g u": ["vim::PushOperator", "Lowercase"],
       "g shift-u": ["vim::PushOperator", "Uppercase"],
       "g ~": ["vim::PushOperator", "OppositeCase"],
+      "\"": ["vim::PushOperator", "Register"],
       "ctrl-pagedown": "pane::ActivateNextItem",
       "ctrl-pageup": "pane::ActivatePrevItem",
       // tree-sitter related commands
@@ -399,6 +400,7 @@
   {
     "context": "Editor && vim_mode == visual && vim_operator == none && !VimWaiting",
     "bindings": {
+      "\"": ["vim::PushOperator", "Register"],
       // tree-sitter related commands
       "[ x": "editor::SelectLargerSyntaxNode",
       "] x": "editor::SelectSmallerSyntaxNode"