lsp: Identify language servers by their configuration (#35270)

- **WIP: reorganize dispositions**
- **Introduce a LocalToolchainStore trait and use it for LspAdapter
methods**

Closes #35782
Closes #27331

Release Notes:

- Python: Improved propagation of a selected virtual environment into
the LSP configuration. This should the make all language-related
features such as Go to definition or Find all references more reliable.

---------

Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Lukas Wirth <lukas@zed.dev>

crates/languages/src/json.rs

@@ -8,8 +8,8 @@ use futures::StreamExt;
 use gpui::{App, AsyncApp, Task};
 use http_client::github::{GitHubLspBinaryVersion, latest_github_release};
 use language::{
-    ContextProvider, LanguageName, LanguageRegistry, LanguageToolchainStore, LocalFile as _,
-    LspAdapter, LspAdapterDelegate,
+    ContextProvider, LanguageName, LanguageRegistry, LocalFile as _, LspAdapter,
+    LspAdapterDelegate, Toolchain,
 };
 use lsp::{LanguageServerBinary, LanguageServerName};
 use node_runtime::{NodeRuntime, VersionStrategy};
@@ -303,7 +303,7 @@ impl LspAdapter for JsonLspAdapter {
     async fn check_if_user_installed(
         &self,
         delegate: &dyn LspAdapterDelegate,
-        _: Arc<dyn LanguageToolchainStore>,
+        _: Option<Toolchain>,
         _: &AsyncApp,
     ) -> Option<LanguageServerBinary> {
         let path = delegate
@@ -404,7 +404,7 @@ impl LspAdapter for JsonLspAdapter {
         self: Arc<Self>,
         _: &dyn Fs,
         delegate: &Arc<dyn LspAdapterDelegate>,
-        _: Arc<dyn LanguageToolchainStore>,
+        _: Option<Toolchain>,
         cx: &mut AsyncApp,
     ) -> Result<Value> {
         let mut config = self.get_or_init_workspace_config(cx).await?;
@@ -529,7 +529,7 @@ impl LspAdapter for NodeVersionAdapter {
     async fn check_if_user_installed(
         &self,
         delegate: &dyn LspAdapterDelegate,
-        _: Arc<dyn LanguageToolchainStore>,
+        _: Option<Toolchain>,
         _: &AsyncApp,
     ) -> Option<LanguageServerBinary> {
         let path = delegate.which(Self::SERVER_NAME.as_ref()).await?;