Add overload for GetBoolMSBuildProperty with default value

Introduces a new overload of GetBoolMSBuildProperty in AnalyzerConfigOptionsProviderExtensions to allow specifying a default value if the property is missing or empty. Updates PolyfillsGenerator to use this overload for UseEmbeddedAttributeForGeneratedTypes, defaulting to true.

Author: Sergio0694

src/PolySharp.SourceGenerators/Extensions/AnalyzerConfigOptionsProviderExtensions.cs

@@ -46,6 +46,28 @@ public static bool GetBoolMSBuildProperty(this AnalyzerConfigOptionsProvider opt
             string.Equals(propertyValue, bool.TrueString, StringComparison.OrdinalIgnoreCase);
     }
 
+    /// <summary>
+    /// Gets the value of a <see cref="bool"/> MSBuild property.
+    /// </summary>
+    /// <param name="options">The input <see cref="AnalyzerConfigOptionsProvider"/> instance.</param>
+    /// <param name="propertyName">The MSBuild property name.</param>
+    /// <param name="defaultValue">The default value for the property, if missing.</param>
+    /// <returns>The value of the specified MSBuild property, or <paramref name="defaultValue"/>.</returns>
+    public static bool GetBoolMSBuildProperty(this AnalyzerConfigOptionsProvider options, string propertyName, bool defaultValue = false)
+    {
+        if (!options.GlobalOptions.TryGetValue($"build_property.{propertyName}", out string? propertyValue))
+        {
+            return defaultValue;
+        }
+
+        if (string.IsNullOrEmpty(propertyValue))
+        {
+            return defaultValue;
+        }
+
+        return string.Equals(propertyValue, bool.TrueString, StringComparison.OrdinalIgnoreCase);
+    }
+
     /// <summary>
     /// Gets the value of an MSBuild property representing a semicolon-separated list of <see cref="string"/>-s.
     /// </summary>

src/PolySharp.SourceGenerators/PolyfillsGenerator.Polyfills.cs

@@ -86,7 +86,7 @@ private static GenerationOptions GetGenerationOptions(AnalyzerConfigOptionsProvi
         bool usePublicAccessibilityForGeneratedTypes = options.GetBoolMSBuildProperty(PolySharpMSBuildProperties.UsePublicAccessibilityForGeneratedTypes);
 
         // Check whether to emit the '[Embedded]' attribute and apply it to generated types
-        bool useEmbeddedAttributeForGeneratedTypes = options.GetBoolMSBuildProperty(PolySharpMSBuildProperties.UseEmbeddedAttributeForGeneratedTypes);
+        bool useEmbeddedAttributeForGeneratedTypes = options.GetBoolMSBuildProperty(PolySharpMSBuildProperties.UseEmbeddedAttributeForGeneratedTypes, defaultValue: true);
 
         // Do the same as above for all other available boolean properties
         bool includeRuntimeSupportedAttributes = options.GetBoolMSBuildProperty(PolySharpMSBuildProperties.IncludeRuntimeSupportedAttributes);