Improve JetBrains keymap for dock toggling (#35234)

Follow-up to: 
- https://github.com/zed-industries/zed/pull/34641
- https://github.com/zed-industries/zed/pull/35230

This improves Zed's behavior with the Jetbrains keymap for toggling
specific docks/sidebars with cmd-0 thru cmd-9 (macos) and alt-0 thru
alt-9 (linux). Added in
https://github.com/zed-industries/zed/pull/34641. Additionally, this
also maps `ctrl-b` / `ctrl-alt-`b to their JetBrains equivalents
(`editor::GoToDefinition` and `editor::GoToDefinitionSplit`) instead of
the default vscode-compatable behavior (toggle left / right dock). This
is because we those specific toggles and a default Hide keyboard
shortcut (`shift-escape`) added in
https://github.com/zed-industries/zed/pull/35230.

Thanks to @thomaseizinger for raising this in:
-
https://github.com/zed-industries/zed/discussions/34643#discussioncomment-13856746

Release Notes:

- Improve support keyboard-based dock show/hide in Jetbrains keymap.

assets/keymaps/macos/jetbrains.json

@@ -109,6 +109,21 @@
       "cmd-7": "outline_panel::ToggleFocus"
     }
   },
+  {
+    "context": "Pane", // this is to override the default Pane mappings to switch tabs
+    "bindings": {
+      "cmd-1": "project_panel::ToggleFocus",
+      "cmd-2": null, // Bookmarks (left dock)
+      "cmd-3": null, // Find Panel (bottom dock)
+      "cmd-4": null, // Run Panel (bottom dock)
+      "cmd-5": "debug_panel::ToggleFocus",
+      "cmd-6": "diagnostics::Deploy",
+      "cmd-7": "outline_panel::ToggleFocus",
+      "cmd-8": null, // Services (bottom dock)
+      "cmd-9": null, // Git History (bottom dock)
+      "cmd-0": "git_panel::ToggleFocus"
+    }
+  },
   {
     "context": "Workspace || Editor",
     "bindings": {
@@ -147,6 +162,7 @@
     }
   },
   { "context": "GitPanel", "bindings": { "cmd-0": "workspace::CloseActiveDock" } },
+  { "context": "ProjectPanel", "bindings": { "cmd-1": "workspace::CloseActiveDock" } },
   { "context": "DebugPanel", "bindings": { "cmd-5": "workspace::CloseActiveDock" } },
   { "context": "Diagnostics > Editor", "bindings": { "cmd-6": "pane::CloseActiveItem" } },
   { "context": "OutlinePanel", "bindings": { "cmd-7": "workspace::CloseActiveDock" } },