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To handle method validation errors in ResponseEntityExceptionHandler, MethodValidationException and associated types should not depend on Bean Validation. To that effect: 1. MethodValidationResult and ParameterValidationResult no longer make the underlying ConstraintViolation set available, and instead expose only the adapted validation errors (MessageSourceResolvable, Errors), analogous to what SpringValidatorAdapter does. And likewise MethodValidationException no longer extends ConstraintViolationException. 2. MethodValidationPostProcessor has a new property adaptConstraintViolations to decide whether to simply raise ConstraintViolationException, or otherwise to adapt the ConstraintViolations and raise MethodValidationException instead, with the former is the default for compatibility. 3. As a result, the MethodValidator contract can now expose methods that return MethodValidationResult, which provided more flexibility for handling, and it allows MethodValidationAdapter to implement MethodValidator directly. 4. Update Javadoc in method validation classes to reflect this shift, and use terminology consistent with Spring validation in classes without an explicit dependency on Bean Validation. See gh-30644
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