chore: Extract languages from zed crate (#8270)

- Moves languages module from `zed` into a separate crate. That way we
have less of a long pole at the end of compilation.
- Removes moot dependencies on editor/picker. This is totally harmless
and might help in the future if we decide to decouple picker from
editor.

Before:
```
Number of crates that depend on 'picker' but not on 'editor': 1
Total number of crates that depend on 'picker': 13
Total number of crates that depend on 'editor': 30
```
After:
```
Number of crates that depend on 'picker' but not on 'editor': 5
Total number of crates that depend on 'picker': 12
Total number of crates that depend on 'editor': 26
```
The more crates depend on just picker but not editor, the better in that
case.

Release Notes:

- N/A

crates/zed/src/languages/tailwind.rs

@@ -1,166 +0,0 @@
-use anyhow::{anyhow, Result};
-use async_trait::async_trait;
-use collections::HashMap;
-use futures::StreamExt;
-use gpui::AppContext;
-use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};
-use lsp::LanguageServerBinary;
-use node_runtime::NodeRuntime;
-use serde_json::{json, Value};
-use smol::fs;
-use std::{
-    any::Any,
-    ffi::OsString,
-    path::{Path, PathBuf},
-    sync::Arc,
-};
-use util::{async_maybe, ResultExt};
-
-const SERVER_PATH: &'static str = "node_modules/.bin/tailwindcss-language-server";
-
-fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {
-    vec![server_path.into(), "--stdio".into()]
-}
-
-pub struct TailwindLspAdapter {
-    node: Arc<dyn NodeRuntime>,
-}
-
-impl TailwindLspAdapter {
-    pub fn new(node: Arc<dyn NodeRuntime>) -> Self {
-        TailwindLspAdapter { node }
-    }
-}
-
-#[async_trait]
-impl LspAdapter for TailwindLspAdapter {
-    fn name(&self) -> LanguageServerName {
-        LanguageServerName("tailwindcss-language-server".into())
-    }
-
-    fn short_name(&self) -> &'static str {
-        "tailwind"
-    }
-
-    async fn fetch_latest_server_version(
-        &self,
-        _: &dyn LspAdapterDelegate,
-    ) -> Result<Box<dyn 'static + Any + Send>> {
-        Ok(Box::new(
-            self.node
-                .npm_package_latest_version("@tailwindcss/language-server")
-                .await?,
-        ) as Box<_>)
-    }
-
-    async fn fetch_server_binary(
-        &self,
-        version: Box<dyn 'static + Send + Any>,
-        container_dir: PathBuf,
-        _: &dyn LspAdapterDelegate,
-    ) -> Result<LanguageServerBinary> {
-        let version = version.downcast::<String>().unwrap();
-        let server_path = container_dir.join(SERVER_PATH);
-
-        if fs::metadata(&server_path).await.is_err() {
-            self.node
-                .npm_install_packages(
-                    &container_dir,
-                    &[("@tailwindcss/language-server", version.as_str())],
-                )
-                .await?;
-        }
-
-        Ok(LanguageServerBinary {
-            path: self.node.binary_path().await?,
-            env: None,
-            arguments: server_binary_arguments(&server_path),
-        })
-    }
-
-    async fn cached_server_binary(
-        &self,
-        container_dir: PathBuf,
-        _: &dyn LspAdapterDelegate,
-    ) -> Option<LanguageServerBinary> {
-        get_cached_server_binary(container_dir, &*self.node).await
-    }
-
-    async fn installation_test_binary(
-        &self,
-        container_dir: PathBuf,
-    ) -> Option<LanguageServerBinary> {
-        get_cached_server_binary(container_dir, &*self.node).await
-    }
-
-    fn initialization_options(&self) -> Option<serde_json::Value> {
-        Some(json!({
-            "provideFormatter": true,
-            "userLanguages": {
-                "html": "html",
-                "css": "css",
-                "javascript": "javascript",
-                "typescriptreact": "typescriptreact",
-            },
-        }))
-    }
-
-    fn workspace_configuration(&self, _workspace_root: &Path, _: &mut AppContext) -> Value {
-        json!({
-            "tailwindCSS": {
-                "emmetCompletions": true,
-            }
-        })
-    }
-
-    fn language_ids(&self) -> HashMap<String, String> {
-        HashMap::from_iter([
-            ("Astro".to_string(), "astro".to_string()),
-            ("HTML".to_string(), "html".to_string()),
-            ("CSS".to_string(), "css".to_string()),
-            ("JavaScript".to_string(), "javascript".to_string()),
-            ("TSX".to_string(), "typescriptreact".to_string()),
-            ("Svelte".to_string(), "svelte".to_string()),
-            ("Elixir".to_string(), "phoenix-heex".to_string()),
-            ("HEEX".to_string(), "phoenix-heex".to_string()),
-            ("ERB".to_string(), "erb".to_string()),
-            ("PHP".to_string(), "php".to_string()),
-        ])
-    }
-
-    fn prettier_plugins(&self) -> &[&'static str] {
-        &["prettier-plugin-tailwindcss"]
-    }
-}
-
-async fn get_cached_server_binary(
-    container_dir: PathBuf,
-    node: &dyn NodeRuntime,
-) -> Option<LanguageServerBinary> {
-    async_maybe!({
-        let mut last_version_dir = None;
-        let mut entries = fs::read_dir(&container_dir).await?;
-        while let Some(entry) = entries.next().await {
-            let entry = entry?;
-            if entry.file_type().await?.is_dir() {
-                last_version_dir = Some(entry.path());
-            }
-        }
-        let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
-        let server_path = last_version_dir.join(SERVER_PATH);
-        if server_path.exists() {
-            Ok(LanguageServerBinary {
-                path: node.binary_path().await?,
-                env: None,
-                arguments: server_binary_arguments(&server_path),
-            })
-        } else {
-            Err(anyhow!(
-                "missing executable in directory {:?}",
-                last_version_dir
-            ))
-        }
-    })
-    .await
-    .log_err()
-}