SPQR throws an error for default pageable value

[andreysubbotin]

• Create a service like:

        @GraphQLQuery(name = "springPageableComponent_users")
        public List<PageableUser> users(@GraphQLArgument(name = "page") Pageable page) {
            return users.subList((int) page.getOffset(), (int) (page.getOffset() + page.getPageSize()));
        }

• Try to execute a query without a page.

{
    springPageableComponent_users {
        id
        name
        age
     }
}

• SPQR try to use default values for the page and an exception occurs:

io.leangen.graphql.metadata.strategy.value.InputParsingException: Value: Page request [number: 0, size 20, sort: UNSORTED] could not be parsed into an instance of org.springframework.data.domain.Pageable
    at io.leangen.graphql.metadata.strategy.value.jackson.JacksonValueMapper.fromInput(JacksonValueMapper.java:77) ~[spqr-0.11.2.jar:na]
    at io.leangen.graphql.metadata.strategy.value.ValueMapper.fromInput(ValueMapper.java:11) ~[spqr-0.11.2.jar:na]
    at io.leangen.graphql.generator.mapping.common.InputValueDeserializer.getArgumentValue(InputValueDeserializer.java:32) ~[spqr-0.11.2.jar:na]
    at io.leangen.graphql.execution.ResolutionEnvironment.getInputValue(ResolutionEnvironment.java:116) ~[spqr-0.11.2.jar:na]
    at io.leangen.graphql.execution.OperationExecutor.execute(OperationExecutor.java:84) ~[spqr-0.11.2.jar:na]
    at io.leangen.graphql.execution.OperationExecutor.execute(OperationExecutor.java:58) ~[spqr-0.11.2.jar:na]
    at graphql.execution.ExecutionStrategy.fetchField(ExecutionStrategy.java:270) ~[graphql-java-16.2.jar:na]
    at graphql.execution.ExecutionStrategy.resolveFieldWithInfo(ExecutionStrategy.java:203) ~[graphql-java-16.2.jar:na]
    at graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:60) ~[graphql-java-16.2.jar:na]
    at graphql.execution.Execution.executeOperation(Execution.java:165) ~[graphql-java-16.2.jar:na]
    at graphql.execution.Execution.execute(Execution.java:104) ~[graphql-java-16.2.jar:na]
    at graphql.GraphQL.execute(GraphQL.java:557) ~[graphql-java-16.2.jar:na]
    at graphql.GraphQL.parseValidateAndExecute(GraphQL.java:482) ~[graphql-java-16.2.jar:na]
    at graphql.GraphQL.executeAsync(GraphQL.java:446) ~[graphql-java-16.2.jar:na]