[analysis_server] Add missing bool completions for strict language options in analysis_options

Fixes part of #59827, but not the main issue.

Change-Id: I7f9d6cfd5163a1bf6c72f9eea4bb71872d3dfa15
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/409140
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>

Author: DanTup

pkg/analysis_server/lib/src/services/completion/yaml/analysis_options_generator.dart

@@ -26,9 +26,9 @@ class AnalysisOptionsGenerator extends YamlCompletionGenerator {
       AnalysisOptionsFile.errors: _ErrorProducer(),
       AnalysisOptionsFile.exclude: EmptyProducer(),
       AnalysisOptionsFile.language: MapProducer({
-        AnalysisOptionsFile.strictCasts: EmptyProducer(),
-        AnalysisOptionsFile.strictInference: EmptyProducer(),
-        AnalysisOptionsFile.strictRawTypes: EmptyProducer(),
+        AnalysisOptionsFile.strictCasts: BooleanProducer(),
+        AnalysisOptionsFile.strictInference: BooleanProducer(),
+        AnalysisOptionsFile.strictRawTypes: BooleanProducer(),
       }),
       AnalysisOptionsFile.optionalChecks: MapProducer({
         AnalysisOptionsFile.chromeOsManifestChecks: EmptyProducer(),

pkg/analysis_server/test/src/services/completion/yaml/analysis_options_generator_test.dart

@@ -98,6 +98,36 @@ analyzer:
     assertSuggestion('error');
   }
 
+  void test_analyzer_language_strictCasts() {
+    getCompletions('''
+analyzer:
+  language:
+    strict-casts: ^
+''');
+    assertSuggestion('false');
+    assertSuggestion('true');
+  }
+
+  void test_analyzer_language_strictInference() {
+    getCompletions('''
+analyzer:
+  language:
+    strict-inference: ^
+''');
+    assertSuggestion('false');
+    assertSuggestion('true');
+  }
+
+  void test_analyzer_language_strictRawTypes() {
+    getCompletions('''
+analyzer:
+  language:
+    strict-raw-types: ^
+''');
+    assertSuggestion('false');
+    assertSuggestion('true');
+  }
+
   void test_codeStyle() {
     getCompletions('''
 code-style: