Add "code_actions_on_format" (#7860)

This lets Go programmers configure `"code_actions_on_format": {
  "source.organizeImports": true,
}` so that they don't have to manage their imports manually

I landed on `code_actions_on_format` instead of `code_actions_on_save`
(the
VSCode version of this) because I want to run these when I explicitly
format
(and not if `format_on_save` is disabled).

Co-Authored-By: Thorsten <thorsten@zed.dev>

Release Notes:

- Added `"code_actions_on_format"` to control additional formatting
steps on format/save
([#5232](https://github.com/zed-industries/zed/issues/5232)).
- Added a `"code_actions_on_format"` of `"source.organizeImports"` for
Go ([#4886](https://github.com/zed-industries/zed/issues/4886)).

Co-authored-by: Thorsten <thorsten@zed.dev>

crates/project/src/lsp_command.rs

@@ -123,6 +123,7 @@ pub(crate) struct GetCompletions {
 
 pub(crate) struct GetCodeActions {
     pub range: Range<Anchor>,
+    pub kinds: Option<Vec<lsp::CodeActionKind>>,
 }
 
 pub(crate) struct OnTypeFormatting {
@@ -1603,7 +1604,10 @@ impl LspCommand for GetCodeActions {
             partial_result_params: Default::default(),
             context: lsp::CodeActionContext {
                 diagnostics: relevant_diagnostics,
-                only: language_server.code_action_kinds(),
+                only: self
+                    .kinds
+                    .clone()
+                    .or_else(|| language_server.code_action_kinds()),
                 ..lsp::CodeActionContext::default()
             },
         }
@@ -1664,7 +1668,10 @@ impl LspCommand for GetCodeActions {
             })?
             .await?;
 
-        Ok(Self { range: start..end })
+        Ok(Self {
+            range: start..end,
+            kinds: None,
+        })
     }
 
     fn response_to_proto(