[feat] gva: blocks: add inputs interval and step & add negative paging

lib/modules/gva/resources/schema.gql

lib/modules/gva/src/db.rs

lib/modules/gva/src/schema.rs

lib/modules/gva/src/schema/entities/block.rs

lib/modules/gva/src/schema/inputs.rs

lib/modules/gva/src/schema/inputs/block_interval.rs

lib/modules/gva/src/schema/inputs/paging.rs

lib/modules/gva/src/schema/queries/block.rs

lib/modules/gva/src/schema/queries/blocks.rs

lib/modules/gva/src/schema/queries/current.rs