Allow JsonPath and JsonProperty annotations on accessors

[cjbooms]

I should be able to use the JsonPath and JsonProperty annotations on the property accessors on a class that follows JavaBean conventions.

I used the following test to determine that this functionality is not supported.

@Test
void 'In multi-level structure, with annotated setters must be unmarshalled correctly'() {
    def returnObject = new TestMultiLevelsWithAnnotatedAccessors()

    given(classInstantiator.newInstance(TestMultiLevelsWithAnnotatedAccessors))
            .willReturn(returnObject)

    def result = factory.unmarshall(TestMultiLevelsWithAnnotatedAccessors, multiLevelJson)

    def secondLevelNonAnnotated = result.getSecondLevelNonAnnotated()
    assert null != secondLevelNonAnnotated
    // ============ assert third level =======================
    def thirdLevelJProperty = secondLevelNonAnnotated.getThird_level()

    assert null != thirdLevelJProperty

    assert '3rd field1[1]' == thirdLevelJProperty.absoluteJsonPath
}

I created the following test class for use with this test

public class TestMultiLevelsWithAnnotatedAccessors {

    private SecondLevelWithAnnotatedAccessor secondLevelNonAnnotated;

    @JsonProperty("second_level")
    public void setSecondLevelNonAnnotated(final SecondLevelWithAnnotatedAccessor secondLevelNonAnnotated) {
        this.secondLevelNonAnnotated = secondLevelNonAnnotated;
    }

    public SecondLevelWithAnnotatedAccessor getSecondLevelNonAnnotated() {
        return secondLevelNonAnnotated;
    }

    /**
     * Test class.
     */
    public static final class SecondLevelWithAnnotatedAccessor {

            //CHECKSTYLE:OFF
            private ThirdLevelWithJsonPath thirdLevelWithJsonPath;
            //CHECKSTYLE:ON

            @JsonProperty("third_level")
            public void setThirdLevelWithJsonPath(final ThirdLevelWithJsonPath thirdLevelWithJsonPath) {
                    this.thirdLevelWithJsonPath = thirdLevelWithJsonPath;
            }

            public ThirdLevelWithJsonPath getThird_level() {
                   return thirdLevelWithJsonPath;
            }
   }
}