ruff server: Introduce settings for directly configuring the linter and formatter (#10984)

## Summary

The following client settings have been introduced to the language
server:
* `lint.preview`
* `format.preview`
* `lint.select`
* `lint.extendSelect`
* `lint.ignore`
* `exclude`
* `lineLength`

`exclude` and `lineLength` apply to both the linter and formatter.

This does not actually use the settings yet, but makes them available
for future use.

## Test Plan

Snapshot tests have been updated.

Author: snowsignal

crates/ruff_server/resources/test/fixtures/settings/global_only.json

@@ -6,9 +6,12 @@
             }
         },
         "lint": {
+            "ignore": ["RUF001"],
             "run": "onSave"
         },
         "fixAll": false,
-        "logLevel": "warn"
+        "logLevel": "warn",
+        "lineLength": 80,
+        "exclude": ["third_party"]
     }
 }

crates/ruff_server/resources/test/fixtures/settings/vs_code_initialization_options.json

@@ -53,6 +53,7 @@
             },
             "lint": {
                 "enable": true,
+                "preview": false,
                 "run": "onType",
                 "args": [
                     "--preview"
@@ -85,6 +86,8 @@
         },
         "lint": {
             "enable": true,
+            "preview": true,
+            "select": ["F", "I"],
             "run": "onType",
             "args": [
                 "--preview"