Validate GraphQL pagination input params before API proceeds further

[sophie-cluml]

Background

#217 (comment)

Running validations for GraphQL request input parameters before our code calls data-loading(or data-fetching) functions, saves resources and separates responsibilities. One example I think that will benefit from this change is nodeStatusList API. Currently,validate_and_process_pagination_params is called in the middle of graphql::node::status::load, so if validation fails, the API will return error in the middle. But after change, input params will be validated before graphql::node::status::load, so server resource will be saved, and we are sure that input params are cleaned before we load something from our server.

Related Parts

Currently, validate_and_process_pagination_params is called inside graphql::load_nodes, graphql::load_edges, graphql::outlier::load, and graphql::outlier::load_ranked_outliers_with_filter.