Introduce SimplePropertyRowMapper with flexible constructor/property/field mapping

Includes query(Class) method with value and property mapping support on JdbcClient.
JdbcClient's singleColumn/singleValue are declared without a Class parameter now.

Closes gh-26594
See gh-30931

spring-core/src/main/java/org/springframework/util/ReflectionUtils.java

@@ -609,6 +609,31 @@ public abstract class ReflectionUtils {
 		return null;
 	}
 
+	/**
+	 * Attempt to find a {@link Field field} on the supplied {@link Class} with the
+	 * supplied {@code name}. Searches all superclasses up to {@link Object}.
+	 * @param clazz the class to introspect
+	 * @param name the name of the field (with upper/lower case to be ignored)
+	 * @return the corresponding Field object, or {@code null} if not found
+	 * @since 6.1
+	 */
+	@Nullable
+	public static Field findFieldIgnoreCase(Class<?> clazz, String name) {
+		Assert.notNull(clazz, "Class must not be null");
+		Assert.notNull(name, "Name must not be null");
+		Class<?> searchType = clazz;
+		while (Object.class != searchType && searchType != null) {
+			Field[] fields = getDeclaredFields(searchType);
+			for (Field field : fields) {
+				if (name.equalsIgnoreCase(field.getName())) {
+					return field;
+				}
+			}
+			searchType = searchType.getSuperclass();
+		}
+		return null;
+	}
+
 	/**
 	 * Set the field represented by the supplied {@linkplain Field field object} on
 	 * the specified {@linkplain Object target object} to the specified {@code value}.