Support .editorconfig (#19455)

Closes https://github.com/zed-industries/zed/issues/8534
Supersedes https://github.com/zed-industries/zed/pull/16349

Potential concerns:
* we do not follow up to the `/` when looking for `.editorconfig`, only
up to the worktree root.
Seems fine for most of the cases, and the rest should be solved
generically later, as the same issue exists for settings.json
* `fn language` in `AllLanguageSettings` is very hot, called very
frequently during rendering. We accumulate and parse all `.editorconfig`
file contents beforehand, but have to go over globs and match these
against the path given + merge the properties still.
This does not seem to be very bad, but needs more testing and
potentially some extra caching.


Release Notes:

- Added .editorconfig support

---------

Co-authored-by: Ulysse Buonomo <buonomo.ulysse@gmail.com>

crates/languages/src/rust.rs

@@ -6,7 +6,6 @@ use futures::{io::BufReader, StreamExt};
 use gpui::{AppContext, AsyncAppContext};
 use http_client::github::{latest_github_release, GitHubLspBinaryVersion};
 pub use language::*;
-use language_settings::all_language_settings;
 use lsp::LanguageServerBinary;
 use regex::Regex;
 use smol::fs::{self, File};
@@ -21,6 +20,8 @@ use std::{
 use task::{TaskTemplate, TaskTemplates, TaskVariables, VariableName};
 use util::{fs::remove_matching, maybe, ResultExt};
 
+use crate::language_settings::language_settings;
+
 pub struct RustLspAdapter;
 
 impl RustLspAdapter {
@@ -424,13 +425,13 @@ impl ContextProvider for RustContextProvider {
         cx: &AppContext,
     ) -> Option<TaskTemplates> {
         const DEFAULT_RUN_NAME_STR: &str = "RUST_DEFAULT_PACKAGE_RUN";
-        let package_to_run = all_language_settings(file.as_ref(), cx)
-            .language(Some(&"Rust".into()))
+        let package_to_run = language_settings(Some("Rust".into()), file.as_ref(), cx)
             .tasks
             .variables
-            .get(DEFAULT_RUN_NAME_STR);
+            .get(DEFAULT_RUN_NAME_STR)
+            .cloned();
         let run_task_args = if let Some(package_to_run) = package_to_run {
-            vec!["run".into(), "-p".into(), package_to_run.clone()]
+            vec!["run".into(), "-p".into(), package_to_run]
         } else {
             vec!["run".into()]
         };

crates/languages/src/yaml.rs

@@ -101,7 +101,7 @@ impl LspAdapter for YamlLspAdapter {
 
         let tab_size = cx.update(|cx| {
             AllLanguageSettings::get(Some(location), cx)
-                .language(Some(&"YAML".into()))
+                .language(Some(location), Some(&"YAML".into()), cx)
                 .tab_size
         })?;
         let mut options = serde_json::json!({"[yaml]": {"editor.tabSize": tab_size}});