Add KeyContextView (#19872)

Release Notes:

- Added `cmd-shift-p debug: Open Key Context View` to help debug custom
key bindings



https://github.com/user-attachments/assets/de273c97-5b27-45aa-9ff1-f943b0ed7dfe

crates/language_tools/Cargo.toml

@@ -19,6 +19,7 @@ copilot.workspace = true
 editor.workspace = true
 futures.workspace = true
 gpui.workspace = true
+itertools.workspace = true
 language.workspace = true
 lsp.workspace = true
 project.workspace = true
@@ -28,6 +29,7 @@ theme.workspace = true
 tree-sitter.workspace = true
 ui.workspace = true
 workspace.workspace = true
+zed_actions.workspace = true
 
 [dev-dependencies]
 client = { workspace = true, features = ["test-support"] }