ruff server now supports commands for auto-fixing, organizing imports, and formatting (#10654)

## Summary

This builds off of the work in
https://github.com/astral-sh/ruff/pull/10652 to implement a command
executor, backwards compatible with the commands from the previous LSP
(`ruff.applyAutofix`, `ruff.applyFormat` and
`ruff.applyOrganizeImports`).

This involved a lot of refactoring and tweaks to the code action
resolution code - the most notable change is that workspace edits are
specified in a slightly different way, using the more general `changes`
field instead of the `document_changes` field (which isn't supported on
all LSP clients). Additionally, the API for synchronous request handlers
has been updated to include access to the `Requester`, which we use to
send a `workspace/applyEdit` request to the client.

## Test Plan



7932e30f-d944-4e35-b828-1d81aa56c087

crates/ruff_server/src/session/capabilities.rs

@@ -3,6 +3,8 @@ use lsp_types::ClientCapabilities;
 #[derive(Debug, Clone, PartialEq, Eq, Default)]
 pub(crate) struct ResolvedClientCapabilities {
     pub(crate) code_action_deferred_edit_resolution: bool,
+    pub(crate) apply_edit: bool,
+    pub(crate) document_changes: bool,
 }
 
 impl ResolvedClientCapabilities {
@@ -17,9 +19,25 @@ impl ResolvedClientCapabilities {
         let code_action_edit_resolution = code_action_settings
             .and_then(|code_action_settings| code_action_settings.resolve_support.as_ref())
             .is_some_and(|resolve_support| resolve_support.properties.contains(&"edit".into()));
+
+        let apply_edit = client_capabilities
+            .workspace
+            .as_ref()
+            .and_then(|workspace| workspace.apply_edit)
+            .unwrap_or_default();
+
+        let document_changes = client_capabilities
+            .workspace
+            .as_ref()
+            .and_then(|workspace| workspace.workspace_edit.as_ref())
+            .and_then(|workspace_edit| workspace_edit.document_changes)
+            .unwrap_or_default();
+
         Self {
             code_action_deferred_edit_resolution: code_action_data_support
                 && code_action_edit_resolution,
+            apply_edit,
+            document_changes,
         }
     }
 }