Refine SourceFile record to class conversion

Update conversion logic to deal with annotations.

See gh-29236

spring-core-test/src/test/java/org/springframework/core/test/tools/SourceFileTests.java

@@ -146,6 +146,19 @@ class SourceFileTests {
 		assertThat(sourceFile.getClassName()).isEqualTo("com.example.helloworld.HelloWorld");
 	}
 
+	@Test
+	void getClassNameFromAnnotatedRecord() {
+		SourceFile sourceFile = SourceFile.of("""
+			package com.example;
+
+			public record RecordProperties(
+					@org.springframework.boot.context.properties.bind.DefaultValue("default-value-1") String property1,
+					@org.springframework.boot.context.properties.bind.DefaultValue("default-value-2") String property2) {
+			}
+		""");
+		assertThat(sourceFile.getClassName()).isEqualTo("com.example.RecordProperties");
+	}
+
 	/**
 	 * JavaPoet style API with a {@code writeTo} method.
 	 */