Add option to either use system clipboard or vim clipboard (#7936)

Release Notes:

- vim: Added a setting to control default clipboard behaviour. `{"vim":
{"use_system_clipboard": "never"}}` disables writing to the clipboard.
`"on_yank"` writes to the system clipboard only on yank, and `"always"`
preserves the current behavior. ([#4390
](https://github.com/zed-industries/zed/issues/4390))

---------

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

crates/vim/src/state.rs

@@ -1,5 +1,6 @@
 use std::{ops::Range, sync::Arc};
 
+use collections::HashMap;
 use gpui::{Action, KeyContext};
 use language::CursorShape;
 use serde::{Deserialize, Serialize};
@@ -86,6 +87,8 @@ pub struct WorkspaceState {
     pub recorded_count: Option<usize>,
     pub recorded_actions: Vec<ReplayableAction>,
     pub recorded_selection: RecordedSelection,
+
+    pub registers: HashMap<String, String>,
 }
 
 #[derive(Debug)]