Add ~.validation.method package

Extract classes from ~.validation.beanvalidation without a direct
dependency on beanvalidation.

See gh-30644

spring-context/src/test/java/org/springframework/validation/beanvalidation/MethodValidationAdapterTests.java

@@ -33,6 +33,9 @@ import org.springframework.context.MessageSourceResolvable;
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
 import org.springframework.validation.FieldError;
+import org.springframework.validation.method.MethodValidationResult;
+import org.springframework.validation.method.ParameterErrors;
+import org.springframework.validation.method.ParameterValidationResult;
 
 import static org.assertj.core.api.Assertions.assertThat;