[ty] Request configuration from client (#18984)

## Summary

This PR makes the necessary changes to the server that it can request
configurations from the client using the `configuration` request.
This PR doesn't make use of the request yet. It only sets up the
foundation (mainly the coordination between client and server)
so that future PRs could pull specific settings. 

I plan to use this for pulling the Python environment from the Python
extension.

Deno does something very similar to this.

## Test Plan

Tested that diagnostics are still shown.

crates/ty_server/src/server/api/diagnostics.rs

@@ -1,4 +1,3 @@
-use lsp_server::ErrorCode;
 use lsp_types::notification::PublishDiagnostics;
 use lsp_types::{
     CodeDescription, Diagnostic, DiagnosticRelatedInformation, DiagnosticSeverity, DiagnosticTag,
@@ -46,20 +45,17 @@ impl Diagnostics {
 /// This is done by notifying the client with an empty list of diagnostics for the document.
 /// For notebook cells, this clears diagnostics for the specific cell.
 /// For other document types, this clears diagnostics for the main document.
-pub(super) fn clear_diagnostics(key: &DocumentKey, client: &Client) -> Result<()> {
+pub(super) fn clear_diagnostics(key: &DocumentKey, client: &Client) {
     let Some(uri) = key.to_url() else {
         // If we can't convert to URL, we can't clear diagnostics
-        return Ok(());
+        return;
     };
 
-    client
-        .send_notification::<PublishDiagnostics>(PublishDiagnosticsParams {
-            uri,
-            diagnostics: vec![],
-            version: None,
-        })
-        .with_failure_code(ErrorCode::InternalError)?;
-    Ok(())
+    client.send_notification::<PublishDiagnostics>(PublishDiagnosticsParams {
+        uri,
+        diagnostics: vec![],
+        version: None,
+    });
 }
 
 /// Publishes the diagnostics for the given document snapshot using the [publish diagnostics
@@ -96,22 +92,20 @@ pub(super) fn publish_diagnostics(
 
     // Sends a notification to the client with the diagnostics for the document.
     let publish_diagnostics_notification = |uri: Url, diagnostics: Vec<Diagnostic>| {
-        client
-            .send_notification::<PublishDiagnostics>(PublishDiagnosticsParams {
-                uri,
-                diagnostics,
-                version: Some(snapshot.query().version()),
-            })
-            .with_failure_code(lsp_server::ErrorCode::InternalError)
+        client.send_notification::<PublishDiagnostics>(PublishDiagnosticsParams {
+            uri,
+            diagnostics,
+            version: Some(snapshot.query().version()),
+        });
     };
 
     match diagnostics {
         Diagnostics::TextDocument(diagnostics) => {
-            publish_diagnostics_notification(url, diagnostics)?;
+            publish_diagnostics_notification(url, diagnostics);
         }
         Diagnostics::NotebookDocument(cell_diagnostics) => {
             for (cell_url, diagnostics) in cell_diagnostics {
-                publish_diagnostics_notification(cell_url, diagnostics)?;
+                publish_diagnostics_notification(cell_url, diagnostics);
             }
         }
     }